Mar 6, 2025 · A nebula is a giant cloud of dust and gas in space. 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.

Feb 28, 2025 · This cloud was part of a bigger cloud called a nebula. At some point, the cloud collapsed—possibly because the shockwave of a nearby exploding star caused it to compress. When it collapsed, it fell in on itself, creating a disk of material surrounding it.

Feb 28, 2025 · What Is a Nebula? A nebula is a cloud of dust and gas in space. How Many Solar Systems Are in Our Galaxy? Astronomers have discovered 2,500 so far, but there are likely to be many more! explore; What Is a Supernova? Learn more about these exploding stars! explore; What Is a Gravitational Wave?

Jan 14, 2025 · Drive around the Red Planet and gather information in this fun coding game! play; Play Helios: A Game About How the Sun Makes Energy! Where does the Sun's energy come from? Play Helios to find out! play; Space Volcanoes! Explore the many volcanoes in our solar system using the Space Volcano Explorer. explore; Go With the Flow: An Ocean Currents ...

Mar 6, 2025 · Drive around the Red Planet and gather information in this fun coding game! play; Play Helios: A Game About How the Sun Makes Energy! Where does the Sun's energy come from? Play Helios to find out! play; Space Volcanoes! Explore the many volcanoes in our solar system using the Space Volcano Explorer. explore; Go With the Flow: An Ocean Currents ...

Jun 27, 2019 · A planet is round because of gravity. A planet's gravity pulls equally from all sides. Gravity pulls from the center to the edges like the spokes of a bicycle wheel. This makes the overall shape of a planet a sphere, which is a three-dimensional circle.

Jun 27, 2019 · What Is a Planet? The Short Answer: A planet must do three things: it must orbit a star, it must be big enough to have enough gravity to force a spherical shape, and it must be big enough that its gravity cleared away any objects of a similar size near its orbit.

Mar 6, 2025 · GALEX poster of Jupiter's Ghost, a planetary nebula. The back of the poster explains what a planetary nebula is. It describes the life cycle of a star like our Sun, and what will eventually happen at the end of the Sun's life.

Oct 11, 2024 · Test your nebulae knowledge and match these tumultuous clouds of gas and dust with their true names. These nebula views were taken by the Hubble Space Telescope, which is a telescope about the size of a school bus that orbits around Earth!

The discovery of Uranus played a big role in the discovery of the planet farthest from the Sun—Neptune. Ever since Uranus was discovered, astronomers kept close tabs on where Uranus was in the sky. They noticed that Uranus did not behave like they thought it should.