Exoplanets, Human Spaceflight, Planets, Robotic Spaceflight, Solar System Why won’t the new Horizons spacecraft stop or slow down when it gets to Pluto?
Human Spaceflight Why doesn’t the International Space Station rotate to create artificial gravity like stations in the movies?
Exotic Objects, Stars If a supernova’s original star is massive enough to form a black hole, why is there any explosion? Why doesn’t the entire mass of the original star simply fall onto the newly formed black hole and instantly vanish?
