What is the universe expanding into?

Come on, admit it, you've had this question. "Since astronomers know that the Universe is expanding, what's it expanding into? What's outside of the Universe?" Ask any astronomer and you'll get an unsatisfying answer. We ...

Planetary defenders validate asteroid deflection code

Planetary defense researchers at Lawrence Livermore National Laboratory (LLNL) continue to validate their ability to accurately simulate how they might deflect an Earth-bound asteroid in a study that will be published in ...

Why go back to the Moon?

On September 12, 1962, then US president John F Kennedy informed the public of his plan to put a man on the Moon by the end of the decade.

What is the Oort Cloud?

For thousands of years, astronomers have watched comets travel close to Earth and light up the night sky. In time, these observations led to a number of paradoxes. For instance, where were these comets all coming from? And ...

What is the weather like on Venus?

Venus is often called Earth's "Sister Planet" because of all the things they have in common. They are comparable in size, have similar compositions, and both orbit within the Sun's habitable zone. But beyond that, there are ...

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