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		</div><p>Nasa’s planet spotting telescope has uncovered another three planets, which scientists say include the first nearby super-Earth.</p>
<p>The planet, called GJ 357 d, orbits a star around 31 light years away in the so-called habitable zone, an area far enough from its star to not be too hot but close enough to not be too cold.</p>
<p>In this region, it is possible for liquid water to exist on the surface of a planet if it is rocky, although further research is needed to work out whether GJ 357 d’s atmosphere is dense and warm enough to host liquid water.</p>
<p><em>“GJ 357 d is located within the outer edge of its star’s habitable zone, where it receives about the same amount of stellar energy from its star as Mars does from the Sun,”</em> said Diana Kossakowski, from the Max Planck Institute for Astronomy in Heidelberg, who co-authored the paper in Astronomy &; Astrophysics.</p>
<p><em>“If the planet has a dense atmosphere, which will take future studies to determine, it could trap enough heat to warm the planet and allow liquid water on its surface.”</em></p>
<blockquote class="twitter-tweet" data-width="550" data-dnt="true">
<p lang="en" dir="ltr">.<a href="https://twitter.com/NASA_TESS?ref_src=twsrc%5Etfw">@NASA_TESS</a> observations led to the discovery of three planets around a star known as GJ 357, which is located just 31 light-years away. The outermost planet, GJ 357 d, orbits within the star’s so-called habitable zone. Learn more here: <a href="https://t.co/iTxgSASv7l">https://t.co/iTxgSASv7l</a> <a href="https://t.co/29s3RJTV8h">pic.twitter.com/29s3RJTV8h</a></p>
<p>&mdash; NASA_TESS (@NASA_TESS) <a href="https://twitter.com/NASA_TESS/status/1156573538855325703?ref_src=twsrc%5Etfw">July 31, 2019</a></p></blockquote>
<p><script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script></p>
<p>Lisa Kaltenegger, a professor of astronomy at Cornell University who published a separate paper in the Astrophysical Journal Letters, suggests the planet could harbour life.</p>
<p><em>“This is exciting, as this is humanity’s first nearby super-Earth that could harbour life – uncovered with help from Tess, our small, mighty mission with a huge reach,”</em> she said.</p>
<p><em>“With a thick atmosphere, the planet GJ 357 d could maintain liquid water on its surface like Earth and we could pick out signs of life with upcoming telescopes soon to be online.”</em></p>
<p>GJ 357 d orbits its star every 55.7 days at a range of about 20% of Earth’s distance from the sun, it is claimed.</p>
<p>The three planets orbit a star known as GJ 357, an M-type dwarf, which is around 40% cooler than our own sun and about a third of its mass and size.</p>
<blockquote class="twitter-tweet" data-width="550" data-dnt="true">
<p lang="en" dir="ltr">Observations gathered by <a href="https://twitter.com/NASA_TESS?ref_src=twsrc%5Etfw">@NASA_TESS</a> resulted in the discovery of 3 planets around a star located 31 light-years away. One of these planets is located in the star’s habitable zone – far enough away to not be too hot, and close enough to not be too cold: <a href="https://t.co/B1Vvd4UOjY">https://t.co/B1Vvd4UOjY</a> <a href="https://t.co/l8jxdq18JG">pic.twitter.com/l8jxdq18JG</a></p>
<p>&mdash; Thomas Zurbuchen (@Dr_ThomasZ) <a href="https://twitter.com/Dr_ThomasZ/status/1156576425438253056?ref_src=twsrc%5Etfw">July 31, 2019</a></p></blockquote>
<p><script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script></p>
<p>Tess (Transiting Exoplanet Survey Satellite) – Nasa technology used to discover exoplanets beyond our solar system – noticed the star dimming slightly every 3.9 days in February, a hint that planets were circulating around it.</p>
<p>The nearest of the three planets, GJ 357 b, is around 22% larger than Earth, orbiting its star 11 times closer than Mercury does to the sun.</p>
<p><em>“We describe GJ 357 b as a ‘hot Earth’,”</em> said Enric Palle, an astrophysicist at the Institute of Astrophysics of the Canary Islands.</p>
<p><em>“Although it cannot host life, it is noteworthy as the third-nearest transiting exoplanet known to date and one of the best rocky planets we have for measuring the composition of any atmosphere it may possess.”</em></p>
<p>The middle planet, GJ 357 c, has a mass at least 3.4 times Earth’s, and orbits around its star every 9.1 days.</p>
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