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Updated: 10 hours 35 min ago
SpaceX Starship explosion likely caused by propellant leak, Elon Musk says
SpaceX has traced the likely cause of the explosion that destroyed its Starship vehicle during its Jan. 16 test flight to a leak of liquid oxygen or liquid methane.
100 years ago, Edwin Hubble proved our Milky Way galaxy isn't alone
A century ago, humans didn't know other galaxies existed. Here's how Edwin Hubble changed that view.