SpaceInterstellar visitor ‘Oumuamua may be a comet, not an asteroid The path of the “interstellar asteroid” discovered last year can’t be explained by gravity alone - it was also pushed along by gas, so it might actually be a comet èƵ
SpaceThe sun will die in a blaze of swirling gas in 5 billion years We used to think our sun was too small to produce a planetary nebula when it dies, but new models show it will indeed go out in a massive cloud of bright, hot gas èƵ