Because of Uranus's odd movements in its orbit (the line which a planet follows in moving), it made astronomers search for the new planet.
Xem thêmIt takes our solar system about 230 million years to complete one orbit around the galactic center.
Xem thêmBeyond the orbit of Neptune (the furthermost planet), it takes a long time to leave the Solar System.
Xem thêmMore than 300 robotic spacecraft have explored destinations beyond Earth orbit.
Xem thêmThey sent 2 Nexus S handsets running Android Gingerbread into space to test their sensors in orbit aboard the International Space Station.
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