Explore the axial tilt of the planets in the solar system and discover which planets are the most and least tilted.| Science Notes and Projects
Get Oort Cloud facts. Learn about its location and size, the objects it may contain, and how scientists study it.| Science Notes and Projects
Get facts about the Kuiper belt, including what it is, how far out it extends, and what bodies (Kuiper belt objects or KBOs) it contains.| Science Notes and Projects
Get Pluto facts. Learn about the dwarf planet, which was once considered the ninth planet of the solar system.| Science Notes and Projects
Get facts about the planet Mercury. Learn about its orbit, temperature extremes, and atmosphere. Discover whether life on Mercury is likely.| Science Notes and Projects
Discover interesting Mars facts. Learn about the size, moons, surface features, and seasons of the fourth planet from the Sun.| Science Notes and Projects
Discover what would happen if the Earth stopped rotating either suddenly or slowly. Learn whether anyone could survive the event.| Science Notes and Projects
Learn about gas giants in astronomy. Discover the definition, characteristics, formation, and exploration and get free resources for study.| Science Notes and Projects
Explore Saturn facts with this detailed guide covering the planet's rings, moons, atmosphere, structure, missions, and viewing from Earth.| Science Notes and Projects
Learn about the astronomical unit (au or AU) in astronomy. Get the definition, example distances, history, and worked problems.| Science Notes and Projects
Learn how to calculate your weight on other planets and see values for weight in pounds and kilograms within the solar system.| Science Notes and Projects
Learn what gravity is in physics and astronomy. Get the definition, formulas, and table of gravity on other planets.| Science Notes and Projects
Get the definition of a light year in astronomy. See examples of distances in light years and how the unit compares with parsecs and AU.| Science Notes and Projects
Learn about the layers of the Sun. Get a diagram and see the names and features of the different parts of our favorite star.| Science Notes and Projects