Theia is a hypothesized ancient planet in the early Solar System that, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris gathering to form the Moon.

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How Close Can a Planet Get to a Star and Still Be Habitable?

James Webb Space Telescope could determine if nearby exoplanet is habitable

All the reasons why the once habitable Mars is now hostile towards supporting life

JWST's Hunt for Habitable Exoplanets Finds Disappointment, Again

James Webb Space Telescope gets satellite sidekick to aid search for habitable planets

NASA has put the anticipated VERITAS mission to Venus on an indefinite hold. It would fill the massive gaps in our knowledge about Venus, and help scientists determine what causes a potentially habitable planet to develop an inhospitable atmosphere. You can sign the petition to congress here:

Is it Time for a New Definition of “Habitable?”

There may be hundreds of millions of habitable planets in the Milky Way, new study suggests

A Third of Planets Orbiting Red Dwarf Stars Could be in the Habitable Zone

A New Place to Search for Habitable Planets: “The Soot Line.”

One-third of galaxy's most common planets could be in habitable zone

One-third of galaxy's most common planets could be in habitable zone

Study: One-Third of Red Dwarf Exoplanets Could Be in Habitable Zone

Earth-Sized Exoplanet With Fiery Volcanoes Discovered in Habitable Zone

The search for habitable planets expands

This Volcano-Covered Planet May Be Habitable to Alien Life

Two Super-Earths Found Orbiting a Red Dwarf Star at the Edge of the Habitable Zone

Milky Way’s Own Dynamics May Sabotage Habitable Planetary Systems, Says Study

2 'super-Earth' exoplanets spotted in habitable zone of nearby star

Extraterrestrial life may be more prevalent in an unexpected type of star system; planets that orbit stars with fewer “metals,” may be more likely to be habitable than worlds hosted by metal-rich stars