Gravity used to be the most down-to-earth of ideas, the thing that kept apples falling and planets in line. Now a growing ...
Gravity is usually presented as the most familiar of nature’s forces, the quiet background pull that keeps feet on sidewalks ...
New simulations examine whether the seven planets in the TRAPPIST-1 system could host moons, showing that only small, close-orbiting moons could remain stable over long periods ...