One of the most impressive fireworks displays of the universe. 🌌
This becomes a huge problem for the star because it's not like it's lost any mass over the preceding billions of years. Its heavy outer layers of gas and plasma, previously held aloft by the energy produced by fusion reactions beneath, suddenly cross a tipping point and their mass is too great for the star to hold up. These layers rapidly collapse in toward the star's core, kicking off the supernova process.
Unlike a nova—where a white dwarf accretes a more modest amount of material below this limit and produces a relatively mild explosion of energy from the additional mass but otherwise remains intact—in a Type Ia supernova, the white dwarf destabilizes in an explosive fashion and destroys itself in the process.
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