Dear Sir Sadequain, You have been in my thoughts since last month's extraordinary 'planetary parade' when on February 28, ...

Publications of the Astronomical Society of the Pacific, Vol. 125, No. 925 (March 2013), pp. 227-239 (13 pages) ABSTRACT.This article describes a new grid for the mass–radius relation of three-layer ...

A new study presents a compelling new model for the formation of super-Earths and mini-Neptunes -- planets that are 1 to 4 times the size of Earth and among the most common in our galaxy.

TIMHi, I'm Tim Peake. I'm an astronaut based here at the European Space Agency in Germany, and from December 2015, to June 2016, I spent six months orbiting Earth on the International Space Station.

The way people think of the Solar System has changed many times throughout history. Before the development of the telescope, these ideas were based on what could be seen with the naked eye.