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Assessing the exoplanet real estate market
Jupiter’s Moons
Io: Fire World Robotic probes may someday provide close-up views of some of the most remarkable vistas in the solar
Pluto
Because it is so far from the Sun, astronomers had a hard time measuring Pluto’s size. They finally got it
Asteroids
But the next year, astronomers found a second object in a similar orbit, then another, and another. Instead of a
Neptune
After the discovery of Uranus in 1781, astronomers had a difficult time accurately describing the planet's orbit. Uranus seemed to
Uranus
The poles of most planets aim away from the plane of the solar system; like Earth's poles, they point roughly
Mars
Scientists, too, have speculated about the possibility of life on Mars. During the 1800s, some leading astronomers thought that an