Mikko Tuomi<p>Astronomers have detected the most promising signs yet of a possible <a href="https://scicomm.xyz/tags/biosignature" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>biosignature</span></a> outside the solar system, although they remain cautious.</p><p>They have detected the chemical fingerprints of dimethyl sulfide and/or dimethyl disulfide, in the <a href="https://scicomm.xyz/tags/atmosphere" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>atmosphere</span></a> of the <a href="https://scicomm.xyz/tags/exoplanet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>exoplanet</span></a> K2-18b, which orbits its star in the <a href="https://scicomm.xyz/tags/habitable" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>habitable</span></a> zone.</p><p>On Earth, theyare only produced by <a href="https://scicomm.xyz/tags/life" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>life</span></a>, primarily microbial life such as marine phytoplankton.</p><p><a href="https://scicomm.xyz/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://scicomm.xyz/tags/astrobiology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrobiology</span></a> <br><a href="https://www.cam.ac.uk/stories/strongest-hints-of-biological-activity" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">cam.ac.uk/stories/strongest-hi</span><span class="invisible">nts-of-biological-activity</span></a></p>