") no-repeat center center;background-size:10px 16px;content:' '}@media(min-width:768px){.gpjOba::before{display:none}}.kWYnHL{min-height:389px;margin-bottom:16px;clear:both}@media(min-width:1000px){.kWYnHL{min-height:380px}}.hWxisF{width:100%;box-sizing:border-box}@media(min-width:768px){.hWxisF{max-width:634px}}@media(min-width:1250px){.hWxisF{max-width:622px}}.dvfakS{display:flex;width:auto;box-sizing:border-box;align-items:center;justify-content:flex-start;gap:4px;color:#ec1a2e}.ctXiMg{display:block;font:bold 14px/20px 'Indy Sans','Indy Sans Fallback',sans-serif;text-decoration-line:underline;margin-block:0;text-align:center}.CRIit{display:inline-flex;align-items:center;justify-content:center;gap:4px}.CRIit:hover .sc-aja53j-2,.CRIit:hover .sc-a5wy94-0{color:#ac2a2c}.ghJHgZ{font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}.jlvSeZ{display:flex;position:relative;overflow:hidden;width:auto;height:40px;flex-direction:column;order:-1;gap:8px;opacity:1;transition:all .5s ease-in-out;transition-behavior:allow-discrete}.jlvSeZ::after{--fade-from:rgba(255,255,255,0);--fade-mid:rgba(255,255,255,0.5);--fade-to:#fff;position:absolute;bottom:0;left:0;z-index:1;width:100%;height:40px;background-image:linear-gradient(to bottom,var(--fade-from) 0,var(--fade-mid) 50%,var(--fade-to) 100%);content:'';opacity:1;transition:opacity 150ms ease-out}@media(min-width:768px){.ifXxYf{order:-1}}@media(min-width:768px){.gYsKvs{display:flex;position:relative;align-items:flex-start;margin-top:12px}}@media(min-width:1000px){.qHctg .taboola{display:none}}.qHctg:has(#taboola-carousel-thumbnails){min-height:426px}.qHctg:has(#taboola-mid-article-thumbnails-crime){min-height:405px}@media(min-width:1000px){.qHctg:has(#taboola-carousel-thumbnails),.qHctg:has(#taboola-mid-article-thumbnails-crime){min-height:0}}.hCEqSm .tp-container-inner,.hCEqSm .sc-1suqprf-0{position:relative;box-shadow:0 -22px 16px 22px rgba(255,255,255,0.95)}.hCEqSm.closed{display:none}.jZkFWa{width:32px;color:#3b5998}@media(min-width:768px){.jZkFWa.mobile-only{display:none}}.jZkFWa:hover{color:#2f4779}.iyaxjG{width:32px;color:#000}@media(min-width:768px){.iyaxjG.mobile-only{display:none}}.iyaxjG:hover{color:#4e4e4e}.bxTlJH{width:32px;color:#25d366}@media(min-width:768px){.bxTlJH.mobile-only{display:none}}.bxTlJH:hover{color:#1da851}.cSnwsm{width:32px;color:#ec1a2e}@media(min-width:768px){.cSnwsm.mobile-only{display:none}}.cSnwsm:hover{color:#ac2a2c}.wViVX{display:flex;gap:12px}.kWPFaS{position:fixed;top:0;left:0;z-index:2147483644;background:rgba(0,0,0,0.5);cursor:pointer;opacity:0;transition:opacity 300ms ease-in-out}.kWPFaS.overlay-background--open{width:100vw;height:100vh;opacity:1}.gXmchn{--trans:300ms ease-in-out;position:fixed;top:0;left:0;z-index:2147483645;width:100vw;height:100vh;opacity:0;pointer-events:none;transform:translateY(-24px);transform-origin:top center;transition:transform var(--trans),opacity var(--trans)}.gXmchn.overlay--open{opacity:1;transform:translateY(0);transition-delay:150ms}.gXmchn.overlay--open>:first-child{pointer-events:auto}.cArLiK .sc-17yxc4y-0{display:none}.cArLiK:hover .sc-17yxc4y-0,.cArLiK.bookmark-button-saved .sc-17yxc4y-0{display:block}.cArLiK:hover .sc-17yxc4y-1,.cArLiK.bookmark-button-saved .sc-17yxc4y-1{display:none}.cArLiK.bookmark-button-saved .sc-17yxc4y-0{display:block}.cArLiK.bookmark-button-saved .sc-17yxc4y-1{display:none}.cArLiK.bookmark-button-saved:hover .sc-17yxc4y-0{display:none}.cArLiK.bookmark-button-saved:hover .sc-17yxc4y-1{display:block}.jKfqFn{--margin-x:12px;--modal-width:calc(100% - (var(--margin-x) * 2));--modal-max-width:351px;--padding:60px 16px 42px;--line-height:1.25;display:flex;position:fixed;top:50%;left:50%;overflow:auto;width:var(--modal-width);max-width:var(--modal-max-width);max-height:100vh;box-sizing:border-box;flex-direction:column;align-items:center;justify-content:center;padding:var(--padding);background-color:#eaf2f2;box-shadow:0 1px 1px rgba(0,0,0,0.5);line-height:var(--line-height);transform:translate(-50%,-50%)}@media(min-width:768px){.jKfqFn{--modal-width:600px;--modal-max-width:none;--padding:72px 80px 64px;--line-height:1.2}}@media(min-width:1000px){.jKfqFn{--modal-width:635px}}.eYHQuU{--close-button-margin:16px;position:absolute;top:var(--close-button-margin);right:var(--close-button-margin)}@media(min-width:768px){.eYHQuU{--close-button-margin:24px}}.gVWZyJ{width:100%;max-width:437px;margin-bottom:20px}@media(min-width:768px){.gVWZyJ{margin-bottom:18px}}.gvKsFx{position:absolute;overflow:hidden;width:.01em;height:.01em;padding:0;border:0;clip:rect(0,0,0,0);white-space:nowrap}.loKuIs{width:100%;margin:0}.ktFUxH{margin:0 0 30px;font:bold 26px/1.15 'Indy Serif','Indy Serif Fallback',serif}@media(min-width:768px){.ktFUxH{font:bold 28px/1.15 'Indy Serif','Indy Serif Fallback',serif}}.cnAboz{display:block;width:100%;padding:0;margin:0 0 30px;font:normal 16px/1.44 'Indy Sans','Indy Sans Fallback',sans-serif}@media(min-width:768px){.cnAboz{font:normal 20px/1.44 'Indy Sans','Indy Sans Fallback',sans-serif}}.bdfufZ{display:block;margin-top:30px;color:#222;font:normal 16px/normal 'Indy Sans','Indy Sans Fallback',sans-serif}.cVoYmY{padding:0}.ldnLrS{display:inline-block;width:32px;height:32px;color:#337e81}.ixvYXS{display:flex;flex-direction:row;justify-content:center;gap:12px}.hCHeth{display:flex;position:relative;justify-content:center}@media(min-width:768px){.hCHeth{justify-content:flex-end;padding-top:12px;margin:0}}.hvJvAA{display:flex}.sticky .hvJvAA{flex-direction:column}.kciiLJ{overflow:hidden;height:23px;margin-bottom:8px;border-bottom:0;clear:both}@media(min-width:768px){.kciiLJ{height:25px}}.fSsEip{display:inline-block;flex-shrink:0;margin:0 12px 0 0;font:bold 14px/normal 'Indy Sans','Indy Sans Fallback',sans-serif}.fSsEip::after{content:':'}.kdqbii{display:inline-block;margin-right:12px;margin-bottom:4px;color:#222;font:normal 14px/1.29 'Indy Sans','Indy Sans Fallback',sans-serif;text-decoration:underline}.kdqbii::first-letter {text-transform:capitalize}@media(min-width:1000px){.subscribed .lkPksW{margin-top:-184px}.article-feature:not(.article-feature-video) .subscribed .lkPksW{margin-top:-407px}}.lkPksW>p{margin:16px 0}.article-premium .lkPksW>p{line-height:27px}.lkPksW>h2{font-size:21px}.article-climate .lkPksW>h2{color:#ec1a2e}.article-sgi .lkPksW>h2{color:#ec1a2e}.lkPksW>p:first-child{margin-top:0}.lkPksW span:first-child~p:first-of-type{margin-top:0}.cnknzo{display:flex;position:relative;max-width:100%;min-height:600px;justify-content:center;margin:0 auto;background-color:transparent;clear:both}@media(min-width:1000px){.cnknzo{min-height:450px}}.teads .cnknzo{display:block}.cnknzo [data-mpu]{position:sticky;top:16px}@media(min-width:1000px){.dTdlgq{display:none}}.dTdlgq[data-mpu1]{min-height:600px}.dTdlgq.pb-20{padding-bottom:20px}.gMxIQB{margin:0 0 24px;font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}.fJIQUi{font:bold 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}.eFDpwi{overflow:hidden;width:100%;box-sizing:border-box;margin-bottom:16px}@media(min-width:768px){.eFDpwi{max-width:634px}}@media(min-width:1250px){.eFDpwi{max-width:622px}}.jkkqcL{width:100%;box-sizing:border-box;padding:8px 12px 12px;border-top:8px solid #ec1a2e;background-color:#fde8ea}@media(min-width:768px){.jkkqcL{padding-top:4px;padding-bottom:12px}}.dDFcwe{font:bold 22px/26px 'Indy Serif','Indy Serif Fallback',serif;margin:0 0 12px;text-align:center}@media(min-width:768px){.dDFcwe{font:bold 30px/34px 'Indy Serif','Indy Serif Fallback',serif;letter-spacing:-0.048px;margin-bottom:12px;text-align:left}}.jbPJqN{display:block;margin-bottom:12px}@media(min-width:768px){.jbPJqN{display:none}}.fdEOdF{display:flex;width:100%;box-sizing:border-box;align-items:center;justify-content:center;gap:4px;background-color:#fde8ea;color:#ec1a2e}@media(min-width:768px){.fdEOdF{width:auto;justify-content:flex-start}}.bcQtEw{display:block;font:bold 14px/20px 'Indy Sans','Indy Sans Fallback',sans-serif;text-decoration-line:underline;margin-block:0;text-align:center}.jIgCsj{display:inline-flex;align-items:center;justify-content:center;gap:4px}.jIgCsj:hover .sc-hez36s-5,.jIgCsj:hover .sc-a5wy94-0{color:#ac2a2c}.bhFQeV{font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}.kqOtlp{display:flex;width:100%;flex-direction:column}@media(min-width:768px){.kqOtlp{display:flow-root;gap:24px;transition:margin-bottom .3s ease-in-out}}.bvgAkY{display:flex;width:100%;flex-direction:column;align-items:center;justify-content:center}@media(min-width:768px){.bvgAkY{position:relative;z-index:1;width:212px;flex-shrink:0;justify-content:flex-start;margin-left:24px;float:right}}.ZbvOr{display:none;flex-direction:row;align-items:center;justify-content:center;gap:8px;margin-top:8px}@media(min-width:768px){.ZbvOr{display:flex;margin-top:12px}}.cqHcKs{display:flex;width:100%;align-items:center;justify-content:center;gap:8px;margin-top:8px;margin-bottom:12px}@media(min-width:768px){.cqHcKs{display:none}}@media(min-width:768px){.bjQKsM{order:-1}}.gBaKpR .sc-aja53j-5::after{--fade-from:rgba(253,232,234,0);--fade-mid:rgba(253,232,234,0.5);--fade-to:#fde8ea}@media(min-width:360px){.gBaKpR .sc-aja53j-5 .sc-aja53j-7{display:none}}.dVyExd{display:flex;min-height:600px;justify-content:center}@media(min-width:1000px){.dVyExd{min-height:450px}}.jHlYLm{min-height:600px}@media(min-width:1000px){.jHlYLm{min-height:450px}}.jHlYLm.mobile-only{display:block}@media(min-width:1000px){.jHlYLm.mobile-only{display:none}}.jHlYLm.desktop-only{display:none}@media(min-width:1000px){.jHlYLm.desktop-only{display:block;margin-bottom:16px}}.jHlYLm.desktop-only+p{margin-top:0}.jHlYLm .third-party-ad{position:sticky;top:16px}.czoMqL{width:100%;flex-grow:1}.czoMqL .amp-article-content[amp-access][amp-access-hide]{display:block;overflow:hidden;max-height:360px}.czoMqL .amp-article-content[amp-access][amp-access-hide] .social-share{display:none}.czoMqL .amp-article-content[amp-access][amp-access-hide].show-all-content{max-height:100%}@media(max-width:594px){.czoMqL .amp-article-content[amp-access][amp-access-hide]{max-height:530px}}.czoMqL .amp-newsletter-reg-gate{position:relative;left:-12px;width:calc(100% + 24px)}.czoMqL .social-share{width:100%;padding-top:10px;padding-bottom:20px}@media(min-width:768px){.czoMqL .social-share{justify-content:flex-start}}.czoMqL .social-share.sticky{display:none}@media(min-width:1000px){.czoMqL .social-share.sticky{display:flex;position:sticky;top:14px;width:34px;flex-direction:column;padding-top:0;margin-top:0;margin-left:-25%}.czoMqL .social-share.sticky amp-social-share,.czoMqL .social-share.sticky .sc-mgcah7-0{margin:0 0 16px}.article-feature-video .czoMqL .social-share.sticky{margin-top:0}.article-feature:not(.article-feature-video) .czoMqL .social-share.sticky{margin-top:35%}}.czoMqL.sponsored-article img,.czoMqL.sponsored-article video{width:100%;max-width:602px;height:auto}.czoMqL.sponsored-article iframe{max-width:602px;max-height:400px}.czoMqL .under-article-prompt-donations{padding-bottom:8px;margin-top:-3px}.czoMqL .big-letter{--color:#222;display:flex;position:relative;width:0;height:0;align-items:center;justify-content:center;padding:40px;margin-top:22px;margin-right:12px;border:1px solid var(--color);float:left;font:normal 52px/1 'Indy Serif','Indy Serif Fallback',serif;text-transform:uppercase}.czoMqL .big-letter:first-child{margin-top:6px}.czoMqL .big-letter::before{position:absolute;top:0;left:0;width:100%;height:100%;box-sizing:border-box;border:1px solid var(--color);border-radius:50%;content:''}.czoMqL #taboola-below-article-1{min-height:2350px}@media(min-width:768px){.czoMqL #taboola-below-article-1{min-height:3370px}}.czoMqL #taboola-below-article-1-split-num-1{min-height:130px}@media(min-width:768px){.czoMqL #taboola-below-article-1-split-num-1{min-height:415px}}.czoMqL .sc-fwko30-0+.sc-1xtsh2b-0{margin-top:-16px}@media(min-width:768px){.czoMqL{max-width:636px;margin:0}}@media(min-width:1000px){.czoMqL{max-width:624px;margin:0}.czoMqL.subscribed{max-width:636px}}@media(max-width:999px){.czoMqL{padding-right:0}.czoMqL .under-article-prompt-donations{margin-top:-18px}}.czoMqL .anchor-nav-header{scroll-margin-top:79px}.czoMqL .anchor-nav-header a{color:#222}.czoMqL .anchor-nav-header a:hover{color:#222}.clVPNf{display:flex;flex-wrap:wrap;justify-content:flex-start;margin-bottom:8px;color:#646464;font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}@media(min-width:768px){.clVPNf{width:70%;align-items:center;justify-content:flex-start;margin-bottom:0;font:normal 16px/24px 'Indy Sans','Indy Sans Fallback',sans-serif}}@media(min-width:1000px){.clVPNf{width:70%;margin-bottom:0}}.hIiCJP{display:flex;height:20px;margin:0 12px 8px 0}.article-voices .hIiCJP{height:auto}@media(min-width:425px){.article-voices .hIiCJP{height:20px}}.hIiCJP::before{display:inline-block;align-self:center;margin-top:1px;margin-right:12px;content:'\2022';transform:scale(1.5)}.hIiCJP:first-child::before{content:none}@media(min-width:768px){.hIiCJP{height:24px;margin-bottom:0}.hIiCJP::before{margin-top:2px}}.hIiCJP time{display:block}.hIiCJP time::first-letter {text-transform:capitalize}.eNJptR{display:inline-block;margin:0 12px 8px 0;color:#ec1a2e;font:bold 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif;letter-spacing:-0.5px}.eNJptR:hover,.eNJptR:active{color:#ac2a2c}@media(min-width:768px){.eNJptR{margin-bottom:0}}.cePgis{margin:0 4px 8px 0}.cePgis::before{display:inline-block;margin-top:2px;margin-right:12px;color:#646464;content:'\2022';transform:scale(1.5)}.cePgis:first-child::before{display:none}@media(min-width:768px){.cePgis{margin-bottom:0}}.kuCYzg{display:flex;justify-content:flex-start;padding:0;margin:0 0 16px}@media(min-width:768px){.kuCYzg{display:flex;width:30%;align-items:center;justify-content:flex-end;margin:0}}@media(min-width:1000px){.kuCYzg{width:30%}}.gpMjkH{padding-top:0;border-top:0;border-bottom:0}@media(min-width:768px){.gpMjkH{display:flex;flex-flow:row wrap;padding-bottom:16px}.gpMjkH .sc-1qz44j0-0{order:1}.gpMjkH .sc-1qz44j0-6{order:2}}@media(min-width:1000px){.gpMjkH{flex-direction:row}}.hUayVl{padding:16px 12px 12px;text-align:left;font:bold 14px/18px 'Indy Sans','Indy Sans Fallback',sans-serif}@media(min-width:768px){.hUayVl{padding:16px 16px 12px}}.article-infact .hUayVl{padding:16px 0}@media(min-width:1000px){.hUayVl{padding:24px 0 19px}.article-feature .hUayVl{max-width:968px;margin:0 auto}}.hUayVl a{color:#222}.hUayVl a:hover{color:#ac2a2c}.hUayVl a:hover::after{color:#222}.hUayVl a::after{margin-right:4px;margin-left:4px;content:'>'}.hUayVl a:last-child::after{display:none}.bPeEQC{margin:0 0 20px;letter-spacing:0}.iHWilb{margin:0;color:#646464;font:normal 16px/20px 'Indy Sans','Indy Sans Fallback',sans-serif}@media(min-width:768px){.iHWilb{font:normal 18px/22px 'Indy Sans','Indy Sans Fallback',sans-serif}}@media(min-width:1000px){.iHWilb{font:normal 20px/24px 'Indy Sans','Indy Sans Fallback',sans-serif}}.iHWilb p{font:inherit}.article-feature .iHWilb a{font-weight:bold}.gRuXKg{max-width:968px;margin:0 auto;background:#fff}@media(min-width:1000px){.gRuXKg{padding:0 16px}.parallax .gRuXKg{max-width:1240px}}.clZtvZ{font:bold 32px/36px 'Indy Serif','Indy Serif Fallback',serif;letter-spacing:-0.0156em}@media(min-width:768px){.clZtvZ{font:bold 44px/48px 'Indy Serif','Indy Serif Fallback',serif;letter-spacing:-0.0113em}}@media(min-width:1000px){.clZtvZ{font:bold 54px/58px 'Indy Serif','Indy Serif Fallback',serif;letter-spacing:-0.0092em}}.gLQzaj .sc-qvufca-0{margin:0 12px}@media(min-width:768px){.gLQzaj .sc-qvufca-0{max-width:968px;margin-right:16px;margin-left:16px}}@media(min-width:1000px){.gLQzaj .sc-qvufca-0{margin-right:auto;margin-left:auto}}.gLQzaj .sc-qvufca-2{margin-bottom:16px;color:#222}@media(min-width:768px){.gLQzaj .sc-qvufca-2{margin-bottom:18px}}@media(min-width:1000px){.gLQzaj .sc-qvufca-2{margin-top:0}}.article-feature .gLQzaj .sc-qvufca-2{text-align:center}@media(min-width:1000px){.article-feature .gLQzaj .sc-qvufca-2{max-width:968px}}.gLQzaj .sc-aeekvc-0{margin-bottom:16px}@media(min-width:1000px){.gLQzaj .sc-aeekvc-0{max-width:968px}}.gLQzaj .sc-aeekvc-0 p{margin-top:0}@media(min-width:768px){.gLQzaj .sc-aeekvc-0 p{margin-bottom:16px}}@media(min-width:2560px){.gLQzaj .sc-aeekvc-0 p{margin-bottom:12px}}.ldpSwp{--bleed:12px;display:flex;box-sizing:border-box;flex-direction:row;gap:32px;padding:16px var(--bleed);background-color:#fff}.article-liveblog .ldpSwp{background-color:#f7f7f7}@media(min-width:768px){.ldpSwp{--bleed:0;max-width:1000px;margin:0 auto}}@media(min-width:1000px){.ldpSwp{--bleed:16px;max-width:1000px;padding:var(--bleed)}}.ilJfaV{overflow:hidden;height:0;color:transparent}.fIgmuu{max-width:100%;margin:0 0 20px}.fIgmuu.sticky{position:sticky;top:16px}.grPbuS{min-height:600px}.grPbuS #mpu1{position:sticky;top:16px}.jfSvuX{min-height:250px}.kdHApG{max-width:100%}.dgoHoz{margin:0 0 6px;color:#646464;font-family:'Indy Sans','Indy Sans Fallback',sans-serif;font-size:15px}.eSkAOW{margin:0 0 12px}.ctSnkl{height:380px}.cCOQKx{width:100%;height:51px}.NgRo{margin-bottom:16px;border-bottom:1px solid #919191}.ksidoU{margin-bottom:16px}.ksidoU [role='listitem']{position:relative;margin-bottom:12px;border-bottom:1px solid #d3d3d3}.ksidoU [role='listitem'] .sc-u4n1j-0{display:flex;position:absolute;bottom:16px;left:10px;width:32px;height:32px;align-items:center;justify-content:center;border-radius:50%;background-color:#ec1a2e}.ksidoU [role='listitem'] .sc-u4n1j-0>svg{width:90%;fill:#fff;stroke:transparent}.ksidoU [role='listitem']:first-child{display:block;padding-bottom:0;margin-bottom:12px}.ksidoU [role='listitem']:first-child .sc-u4n1j-0{top:-15px;bottom:auto;left:12px}.ksidoU [role='listitem']:first-child>*:first-child{display:block;width:100%;height:205px}.ksidoU [role='listitem']:first-child>*:last-child{--content-bg:#222;--content-bg-opaque:rgba(34,34,34,0.7);position:absolute;bottom:0;width:100%;padding:28px 12px 12px;background:linear-gradient(to top,var(--content-bg) 70%,var(--content-bg-opaque) 100%) no-repeat;color:#fff;font-size:17px;font-weight:bold}.ksidoU [role='listitem']:last-child{margin-bottom:0;border-bottom:0 none}.bhdekM{min-height:1924px}@media(max-width:767px){.bhdekM{display:none}}.dvQXpA{width:308px}.dvQXpA.hidden{display:none}@media(max-width:999px){.dvQXpA{display:none}}.article-liveblog .bZTaXI{background-color:#f7f7f7}.wQyIS{justify-content:center}.jQYxbM{justify-content:center}
Space Mars audio reveals two speeds of sound Surprising discovery ‘would make it difficult for two people standing only five metres apart to have a conversation’
Subscribe to Independent Premium to bookmark this article Want to bookmark your favourite articles and stories to read or reference later? Start your Independent Premium subscription today.
Subscribe Already subscribed? Log in open image in gallery
A study of the first audio recordings on Mars reveals how sound travels differently on the Red Planet (Getty Images/iStockphoto) Your support helps us to tell the story From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or producing our latest documentary, 'The A Word', which shines a light on the American women fighting for reproductive rights, we know how important it is to parse out the facts from the messaging.
At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.
The Independent is trusted by Americans across the entire political spectrum. And unlike many other quality news outlets, we choose not to lock Americans out of our reporting and analysis with paywalls. We believe quality journalism should be available to everyone, paid for by those who can afford it.
Your support makes all the difference. Read more Scientists studying the first ever audio recordings made on Mars have discovered there are two speeds of sound on the surface of the planet.
Microphones attached to Nasa’s Perseverance rover, which landed on Mars in February 2021, captured five hours of audio from the Red Planet, which has now been analysed by an international team of scientists.
The recordings included noises made by the rover and its accompanying helicopter, as well as a light Martian wind.
The analysis confirmed for the first time that the speed of sound is slower on Mars compared to Earth, which had been expected due to the atmosphere being much thinner. Comprised of 95 per cent carbon dioxide, Mars’ atmosphere carries sound at 240 metres per second, compared to Earth’s 340 metres per second.
In a surprise discovery, the researchers also noted that there appeared to be two speeds of sound: One for high-pitched sounds and one for low frequencies.
The whir of the helicopter rotors made a sound that travelled at 240 metres per second, while a zap noise made by the rover’s laser travelled at 250 metres per second.
This disparity would “make it difficult for two people standing only five metres apart to have a conversation,” the French National Centre for Scientific Research (CNRS) said in a statement.
open image in gallery
An illustration indicating the placement of the two microphones on the Perseverance rover (Nasa/ JPL-Caltech) Another of the observations made by the researchers was how quiet the surface of Mars is.
“At some point, we thought the microphone was broken, it was so quiet,” said Sylvestre Maurice, an astrophysicist at the University of Toulouse in France and lead author of a study detailing the discovery.
This phenomenon is also a result of the planet’s thin atmosphere, though changeable atmospheric conditions could mean this noise level fluctuates with the seasons.
“Mars is very quiet because of low atmospheric pressure,” said Baptiste Chide of Los Alamos National Laboratory in New Mexico.
“But the pressure changes with the seasons on Mars. We are entering a high-pressure season. Maybe the acoustic environment on Mars will be less quiet than it was when we landed.”
The study, titled ‘In situ recording of Mars soundscape’, was published in the journal Nature .
Thank you for registering Please refresh the page or navigate to another page on the site to be automatically logged in Please refresh your browser to be logged in
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies
Comments