The universe is massive, with trillions of stars and galaxies. But one thing is so powerful that it can destroy an entire galaxy in the blink of a cosmic eye. Quasars, short for quasi-stellar radio source. They take in surrounding matter and spit it out with such velocity that whole galaxies don't stand a chance. So, how do they work?

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Modern rockets use liquid fuel to propel them with enough thrust to reach space. But, 70 years ago, NASA was trying to achieve the same results using nuclear power. So, what happened and why did it end up not working?

Humans have long looked up in space and thought about how we could live among the stars one day. Right now, life on Mars would require a ton of equipment and shelter to protect us from the harsh environment. But what if we could make Mars more like Earth? How would we even do that? The answer is lasers!

Supernovas are the largest explosions in the universe. They happen when a dying star sheds its outer layer in a moment of extreme energy. If they're so powerful, what would happen if one were to happen close to us? Would we be able to survive?

Losing everything on your devices is heartbreaking. Think about all you would miss.

Don’t leave it to chance! Take the time to back them up the right way. My pick is IDrive. It’s safe, fast and easy. You can back up all your devices — iPhone, Android, Mac, PC — to one account and access your stuff from anywhere.

When you use my name, Kim, at checkout, you get 90% off your first year. What a deal.