Find out what it's like on other planets. Learn how far away the stars are. Try a fun, space-themed project.
Constellations can help you sort the twinkling dots scattered across the night sky. Connect the stars to see what deep-sky wonders emerge.
The Sun, an average-sized, middle-aged star, formed almost 5 billion years ago from a cloud of gas and dust.
Mercury, the closest planet to the Sun, takes only 88 days to orbit the Sun.
The surface of Venus, the brightest object in the sky after the Sun and Moon, is covered with craters, mountains, volcanos, and lava plains.
Earth is the third planet from the Sun and takes 23 hours, 56 minutes to spin on its axis one time.
The Moon, located 238,000 miles from Earth, has a temperature of 225° F during the day and drops down to –243° at night.
Rust in the soil creates the Red Planet's signature color.
Jupiter is the largest planet in our solar system, with a diameter of 89,000 miles.
Saturn, the sixth planet from the Sun, has a ring system made up of ice and rock particles, some as big as a minivan.
Uranus, the third-largest planet in the solar system, has an average temperature of –350° F and does not have a solid surface.
Neptune has 13 moons; the two largest are Triton and Nereid.
Pluto, reclassified as a dwarf planet in 2006, is located nearly 40 times as far from the Sun as Earth.
Asteroids, chunks of rock and metal that orbit the Sun, sometimes collide with the Earth. This is one possible explanation for the extinction of dinosaurs.
Comets, thought to be leftovers of the early solar system, are made of dust, rocks, organic compounds, and ice.
Observe the changing position of the Sun to determine the cardinal points.
Grab a thick blanket to lie back on and your favorite pair of binoculars. It's time to take your child on a tour of the Milky Way.
Make yourself looney by viewing craters and even making your own.
Look for this icon. This denotes premium subscriber content.
Learn more »