NASA has just premiered Planetary Defenders, a fascinating documentary looking at the high-stakes work geared toward protecting Earth from large asteroids spotted coming our way. The 75-minute ...

There's a whole world under the surface and only Ron has any idea about it. And sometimes the two worlds collide, and sometimes they don't. Ron holds them at arm's length from each other. Watch every ...

The asteroids are as large as around 75 and 91 feet in diameter, according to the Center for Near Earth Object Studies.

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