“The single most powerful element of youth is our inability to know what’s impossible.” -Adam Braun
"I'm going to be a star," says every clump of matter in a molecular cloud, as it prepares to collapse under the tremendous pull of gravitation. But try as they might, only a small fraction of that gas and of those clumps -- the largest and earliest, preferentially -- will ever get there.
This week's Ask Ethan question is one of the shortest and sweetest out there, and comes from Greg Rogers:
If the Sun (and all stars) are mostly Hydrogen and Helium, why don’t planets have about the same distribution of stuff?
They formed from the same things, so why not?