How Can Mercury Have Ice When It’s So Close to the Sun?
Mercury is the closest planet to the Sun, so finding water ice there sounds almost impossible. Sun…
If the Universe Is Expanding, What Is It Expanding Into?
When a balloon grows, it expands into the air around it. When a ripple spreads, it moves across t…
Can Two Galaxies Pass Through Each Other Without Their Stars Colliding?
Imagine two galaxies, each containing billions of stars, heading straight into one another. It so…
What Happens When Two Neutron Stars Collide?
Two objects no bigger than cities can carry more mass than the Sun, circle each other hundreds of…
Why Is NGC 4698’s Center Rotating the Wrong Way? Hubble Reveals a Cosmic Oddity
At first glance, NGC 4698 looks like a calm spiral galaxy: a bright central glow, dusty lanes, an…
Why Does Uranus Spin on Its Side While Other Planets Don’t?
If the planets were spinning tops, Uranus would look like the one that had fallen over but somehow…
Why Is Space Dark If the Universe Is Filled With Trillions of Stars?
Step outside on a clear night and most of the sky is black. That seems perfectly normal—until you…
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