Moon Mirror

Astronomers have a new trick in the hunt for habitable exoplanets, and it involves using the Moon as a gigantic mirror.

Basically, NASA and ESA scientists used the Hubble Space Telescope to capture light that reflected off the Moon after it had traveled through the Earths atmosphere, Space.com reports. By studying that reflection of our habitable atmosphere, the scientists suspect they could search for the same chemical signatures in distant exoplanets, indicating the possibility of alien life.

Typically, when scientists use the term Earth-like exoplanet, theyre referring to a world thats rocky, roughly the same size as our own, and about the right distance from its host star to have a livable temperature. But its much harder to tell if these exoplanets actually have atmospheres or are otherwise remotely hospitable.

One of NASAs major goals is to identify planets that could support life, Hubble scientist Allison Youngblood said in a press release. But how would we know a habitable or an uninhabited planet if we saw one?

Thats why Youngbloods study, published Thursday in The Astronomical Journal, is so important.

This particular study measured the amount of ozone in the Earths atmosphere. Spotting that same chemical signature emanating from an exoplanet would suggest that it may have an oxygen-rich and UV-blocking atmosphere just like ours.

READ MORE: Scientists use moon as a mirror to study Earth during lunar eclipse [Space.com]

More on exoplanets: Scientists Find the Most Earth-Like Exoplanet Ever And Its Nearby

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Scientists Are Using The Moon as a Giant Mirror to Search For Aliens - Futurism