Earth & Space
Why Do Tides Happen?
Tides happen because the moon's gravity pulls on Earth's oceans unevenly, creating two tidal bulges that coastlines rotate through each day.
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Space
Why Is Earth Round?
Earth is round because gravity pulls matter equally from all directions toward the center, shaping large objects into a sphere over millions of years.
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Space
Why Is Gravity Weaker on the Moon?
Gravity is weaker on the moon because the moon has much less mass than Earth. Less mass means less gravitational pull, so objects weigh about one-sixth of what they do on Earth.
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History of Science
Why Is Isaac Newton Famous?
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Physics
How Does Gravity Work?
Explore how gravity works according to Newton and Einstein, why time slows near massive objects, and why gravity is the weakest yet most dominant force in the universe.
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WHAT IF
What Would Gravity Look Like If It Was Visible?
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Where gravity wins completely
What Is a Black Hole?
A black hole is a region of space where gravity is so strong that nothing, not even light, can escape. Here is what they are, how they form, and what falling into one would actually involve.
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SCIENCE HISTORY
Did Isaac Newton Really Discover Gravity?
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