The Solar System is home to a remarkable range of planets, from tiny rocky worlds to massive gas giants. But just how big are ...

Some lucky stargazers could have a double feature of the planet Venus this weekend. On Saturday and Sunday, the Earth will have an inferior conjunction (closest approach) with Venus, the sixth-largest ...

However, seismic anomalies detected on Mars by the InSight mission reveal that the mantle is far from smooth and contains ...