these three planets lie in roughly the same neighborhood of the solar system and are thought to consist of roughly the same mix of elementary stuff. Earth became heavenly, Mars froze solid ...

Elon Musk is taking the long view. The billionaire SpaceX founder has long said that humanity needs to expand its footprint out into the solar system — specifically to Mars, which is the most suitable ...

Unlike Earth, Mars lacks a global magnetic field and interacts with the solar wind directly. Over billions of years, this ...

With a radius of 2,106 miles, Mars is the seventh largest planet in our solar system and about half the diameter of Earth. Its surface gravity is 37.5 percent of Earth’s. Mars rotates on its ...

Kosmos-482, a spacecraft bound for Venus in 1972, was a time capsule from the Cold War when superpowers had broad ambitions for exploring the solar system.

Mars is most like Earth. Both have valleys and ... light to get through In the centre of the Solar System is the Sun, our star. It is a huge ball of burning gas made mostly of hydrogen.

The four inner planets, Mercury, Venus, Earth and Mars, are small ... A star and the rest of a solar system form from a nebula. Star: a star is a massive ball of extremely hot gas, which is ...