Mercury, Venus, and Mars sit within the same general neighborhood as Earth, yet each has followed a radically different path.

Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...

Illustration comparing the planets of the Solar System and the Sun on the same scale. The planets are shown to scale relative to each other but their distances are not. From left to right the bodies ...

Overview Energy, a startup attempting to develop a space-based solar power system, plans to demonstrate its technology from a satellite in low Earth orbit in 2028. The Ashburn, Virginia-based company, ...

Another day, another ambitious company emerges to harness the power of the Sun from Earth's orbit. Okay, it's not quite that common an occurrence, but there are indeed a number of firms giving this a ...