When haze built up in the atmosphere of Archean Earth, the young planet might have looked like this artist's interpretation - a pale orange dot.   A team led by Goddard scientists thinks the haze was self-limiting, cooling the surface by about 36 degrees Fahrenheit (20 Kelvins) – not enough to cause runaway glaciation. The team’s modeling suggests that atmospheric haze might be helpful for identifying earthlike exoplanets that could be habitable.
NASA/Goddard Space Flight Center/Francis Reddy
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/gsfc/32407459560">https://www.flickr.com/photos/gsfc/32407459560</a>; see also <a rel="nofollow" class="external free" href="https://www.nasa.gov/feature/goddard/2019/shining-starlight-on-the-search-for-life">https://www.nasa.gov/feature/goddard/2019/shining-starlight-on-the-search-for-life</a> and <a rel="nofollow" class="external free" href="https://www.nasa.gov/feature/goddard/2017/nasa-team-looks-to-ancient-earth-first-to-study-hazy-exoplanets">https://www.nasa.gov/feature/goddard/2017/nasa-team-looks-to-ancient-earth-first-to-study-hazy-exoplanets</a>