Show your support for StarDate with this Gildan 100 percent cotton T-shirt! It comes in basic black with the StarDate logo printed in white. Please indicate your desired size (S, M, L, XL, XXL). Order here!
You are here
Our new StarDate T-Shirt is available now!
To help you and your family stay in touch with the rest of the universe while you're staying at home, we've reduced the prices of our combo packages to $35 per year.
A total solar eclipse will take place on August 21. It will cover a narrow slice of the United States, from Oregon to South Carolina. Millions of Americans are expected to travel to the eclipse path, making it the most-viewed solar eclipse in history.
Why does the Moon have phases?
Io: Fire World
Robotic probes may someday provide close-up views of some of the most remarkable vistas in the solar system, from the canyons of Mars to the ice-geysers of Triton. For a true hot-spot, they might show us the surface of Io, one of the moons of Jupiter. It is an eerie landscape of active volcanoes, tall mountains, and plains covered with frozen sulfur.
Deimos is farther away and moves slowly from east to west. Deimos would look like a small dot of light in the sky. Phobos is slowly moving closer to Mars. In another 50 to 100 million years, it will crash into Mars.
Phobos is small, dark, and airless. And it's one of the driest bodies in the solar system.
Triton, the largest satellite of Neptune, orbits in the opposite direction from most moons, suggesting that Neptune captured it in the distant past. Millions of years from now, Triton will move so close to Neptune that tidal forces will rip Triton apart, forming bright new rings around the giant planet.
Most of what we know about Triton came from Voyager 2, which photographed a landscape that is tinted subtle shades of pink, brown, and blue. Much of it resembles a cantaloupe, with ridges thousands of feet tall. Flowing ice or vaporizing gas may have carved this wrinkly terrain.
Because it is so far from the Sun, astronomers had a hard time measuring Pluto's size. They finally got it right in the 1980s, after James Christy discovered a companion object. By watching Pluto and the companion, named Charon, eclipse each other, they measured Pluto's diameter at about 1,400 miles -- about one-third less than the diameter of Earth's Moon.
Pluto is basically a ball of frozen nitrogen, methane, and carbon dioxide wrapped around a small core of rock. On average, it's farther from the Sun than any other of the major planets, so its surface is bitterly cold.