Feeling a little cramped? There's plenty of room beneath the ocean's surface — in fact, there you'll find 95% of Earth's living space.
How deep is deep? Well, you could hide 20 Washington Monuments stacked atop each other. And what lives in this perpetually dark place? More than we know. Explore a world that's also deep in mystery.
When a full moon, the Earth, and the sun are exactly aligned, we might be lucky enough to witness a lunar eclipse. That’s when the Earth blocks sunlight, and the moon slips into our planet’s shadow.
Investigate the three types of lunar eclipses, including what makes each happen, why one kind is really rare, and why the moon might glow a faint red.
Icebergs are freshwater ice floating in seawater. Roughly 1/9th of the ice is actually visible above the surface of the water — the rest is lurking out of sight.
Icebergs can be unstable and hazardous. How are icebergs made? How big can they be? And how long can an iceberg float? Get the details.
Sure, taking humans safely to the Moon and back was the driving reason behind the Apollo program. But it wasn't the only goal. Scientific exploration and a global technology race also fueled the project.
Explore all 17 manned Apollo missions — along with the test flights and unmanned Apollo-Saturn missions.
Far from empty, the space between Earth and the sun is full of light, charged particles, and magnetic fields. Here in the heliosphere, the sun exerts great influence on the planets and satellites.
Travel to this area and discover the great effects of solar forces and how they interact with our planet and the spacecraft monitoring their activity.