NGC 290

Will the Sun make a planetary nebula when it dies?. In around 7 billion years, we expect the Sun to run out of fuel, dying in a planetary nebula/white dwarf combination. Is that for certain?.

Here in our Universe, the most limiting factor behind the largest structures we see is time. Shortly after the Big Bang, there were no stars, galaxies, or black holes: objects that require…

Have any stars visible to human eyes already died?. All stars, eventually, run out of fuel and die. Given all the stars we can see and the vast distance to them, are any of them already dead?.