Stars If supermassive stars burn their fuel in millions of years, and solar-mass stars like our Sun last billions of years, then how long is the life of a red or brown dwarf star?
Science I know Einstein’s famous equation E=mc2 has to do with energy, but what units are used and what do they mean?
Science I’ve read Saturn has a density less than water’s. How do scientists know Saturn’s mass and volume to figure this out?
