| Even if there is no native Mars life, still, it's our only chance to see what happens to a terrestrial planet, left to billions of years, if it doesn't develop life. |
| Statistically speaking, this means that a randomly placed alien outside the solar system has a 1 in 40 chance of observing a single terrestrial planet in our solar system. |
| This terrestrial planet is roughly 2.82 times the mass of Earth and orbits within the star's habitable zone. |
| Anglada-Escudé and his colleagues estimate that Proxima b is at least 1.3 times as big as Earth and is most likely a terrestrial planet, with a surface. |
| First is the classical scenario in which the giant planets begin roughly in their final locations and the disk of planetesimals and embryos in the terrestrial planet region extends all the way into the outer asteroid belt region. |
| Liquid water is one of the most important materials affecting the climate and habitability of a terrestrial planet. |
