![Telltale Greenhouse Gases Could Signal Alien Activity](https://cdn.newsserve.net/en/knowledge/University-of-California-Riverside_20190128.jpg)
Telltale Greenhouse Gases Could Signal Alien Activity
If aliens modified a planet in their solar system to make it warmer, we’d be able to tell. A new UC Riverside study identifies the artificial greenhouse gases that would be giveaways of a terraformed planet.
A terraformed planet has been artificially made hospitable for life. The gases described in the study would be...