Planets do not take much longer to form after stars have formed. For example, the Sun formed 4.6 billion years ago, and the Earth about 4.5 billion years ago. However, scientists now say it is not necessarily the only possibility. ...

Earth may be the only planet we know of that supports such a diverse diversity of species, but that does not imply that our globe is necessarily a pleasant place to live. Earth was a harsh and scorching environment at ...

Astronomers have identified a strange planet not present in our solar system orbiting other stars. It is neither too large nor too tiny but falls between the Earth’s and Neptune’s radii. Dense “super-Earths,” more prominent than Earth, are found near ...