Tag Archives: hydrogen fusion

High Mass Stars: Crash Course Astronomy #31

Stars are in a constant struggle between gravity trying to collapse them and their internal heat trying to inflate them. For most of a star’s life, these two forces are at an uneasy truce. For a star like the Sun, the balance tips in its twilight years. For a brief glorious moment it expands… but… Read More »

Low Mass Stars: Crash Course Astronomy #29

Stars in the sky look pretty. Flickering, intense diamonds dotting the velvety night. But make no mistake: They are churning cauldrons of violence, barely constrained thermonuclear generators, creating enough energy to vaporize the Earth a thousand times over. Their lives depend on it. Heck, our lives depend on it! But in their case, how they… Read More »

Brown Dwarfs: Crash Course Astronomy #28

The sky, we now know, is full of stars AND planets. Stars are massive enough to fuse hydrogen into helium in their cores, generating energy. The heat created by that process tries to expand them, but their gravity balances that outward force, creating an equilibrium. Planets, even gas giants like Jupiter, are far too small… Read More »