Why is the universe the way it is? Over the years, scientists have explored many ways to explain the cosmos, leading to some crazy-sounding ideas.
From the beginning of the universe to the present day, it’s one of the few things we regard as regular and unchanging. We look at the physics of time.
What's the weather like on other worlds? Expect methane rain, global haboobs and a 10,000-mile-wide hurricane.
The European Space Agency’s Space Situational Awareness program is tackling the problem on three fronts.