2025年1月14日 · A supernova is the biggest explosion that humans have ever seen. Each blast is the extremely bright, super-powerful explosion of a star. An illustration of one of the brightest and most energetic supernova explosions ever recorded. Image credit: NASA/CXC/M.Weiss. What causes a supernova?

2025年1月14日 · Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form.

2022年7月18日 · In this pairing game, keep the Sun shining bright by matching up particles. The goal? To convert hydrogen atoms into helium atoms. This process is called nuclear fusion. The Sun is a major source of energy for us on Earth. Where does this energy come from? It comes from a process called fusion. One type of fusion happens when the Sun combines ...

2025年1月14日 · 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 single point.He said the universe stretched and expanded to get as big as it is now, and that it could keep on stretching.. What an Idea!

2025年1月14日 · supernova The brilliant explosion of a massive star at the end of its life. A supernova happens in about 15 seconds and shines with the light of an entire galaxy.

2025年1月14日 · What Is a Supernova? Learn more about these exploding stars! explore; What Is a Gravitational Wave? How do gravitational waves give us a new way to learn about the universe? explore; What Is an Exoplanet? What is an exoplanet? And how do we know they're out there? explore; Searching for Other Planets Like Ours. Exoplanets are far away and hard ...

2025年1月14日 · The solar system is a pretty busy place. It’s got all kinds of planets, moons, asteroids, and comets zipping around our Sun. But how did this busy stellar neighborhood come to be?

2025年1月14日 · More fun facts about the Sun! The Sun goes through ups and downs in activity like solar flares. It gets more active with more sunspots and then less active over a period of 11 years.

2025年1月14日 · What Is a Supernova? Learn more about these exploding stars! explore; Glossary. Find definitions of space and Earth science terms . explore; Glossary for "Sign Here!" words. Defines words in "Sign Here" game. Explore the Electromagnetic Spectrum. The windows show the Universe in all its colors. explore

2022年8月29日 · This process—called nuclear fusion—releases energy while creating a chain reaction that allows it to occur over and over and over again. That energy builds up. It gets as hot as 27 million degrees Fahrenheit in the sun’s core. The energy travels outward through a large area called the convective zone.