Sep 25, 2025 · A supernova of a star more than about 10 times the size of our sun may leave behind the densest objects in the universe— black holes. The Crab Nebula is the leftover, or …

Sep 25, 2025 · If you have looked into the night sky, you may have noticed the Moon appears to change shape each night. Some nights, the Moon might look like a narrow crescent. Other …

Sep 25, 2025 · What's This Big Bang All About? In 1927, an astronomer named Georges Lemaître had a big idea. He said that a very long time ago, the universe started as just a …

Jun 27, 2019 · Our Sun is a bright, hot ball of hydrogen and helium at the center of our solar system. It is 864,000 miles (1,392,000 km) in diameter, which makes it 109 times wider than …

Sep 25, 2025 · The layer made of layersThe stratosphere is a layer of Earth’s atmosphere. The stratosphere is located above the troposphere and below the mesosphere.

Sep 25, 2025 · There are a few different definitions of constellations, but many people think of constellations as a group of stars. The constellations you can see at night depend on your …

Sep 25, 2025 · Learn more about these exploding stars!Una supernova es la explosión más grande que los humanos hayan contemplado jamás. Todas las explosiones de las estrellas …

Sep 25, 2025 · Supernova What Is a Supernova? explore Glossary explore Glossary for "Sign Here!" words Explore the Electromagnetic Spectrum explore Printed Product Downloads explore

Aug 29, 2022 · Space is a pretty dark place. Even so, some areas are darker than others. Nothing is darker than a black hole. A black hole is an area of such immense gravity that nothing—not …

Sep 25, 2025 · Credit: NASA/JPL-Caltech Explore the "Magic Windows" of the electromagnetic spectrum below! Radio Waves Credit: NASA/JPL-Caltech Radio waves are very long and not …