Tag Archives: Uranus

this day in the yesteryear: Planet Neptune Is Discovered (1846)


Planet Neptune Is Discovered (1846)

Neptune is notable for being the first planet to be discovered by way of mathematical prediction rather than standard observation. Galileo observed Neptune twice in the early 1600s, but he mistook the planet for a fixed star and is therefore not credited with its discovery. Centuries later, small changes in Uranus’s orbit led astronomers to seek out and discover the eighth and outermost planet of our solar system. Who predicted Neptune’s location in the 1840s within 1° of where it was found? More… Discuss

NEWS: FIRST RINGED ASTEROID IDENTIFIED


First Ringed Asteroid Identified

An asteroid orbiting the Sun between Saturn and Uranus has become the first asteroid identified as having rings. Until now, this feature had only been observed around the four gas giants, Saturn, Jupiter, Uranus, and Neptune. The 154-mile (248-km) asteroid, Chariklo, appears to have two distinct rings—one 4.3 miles (7 km) wide and the other 1.9 miles (3 km) wide—separated by a gap of about 5.6 miles (9 km). Given the rings’ crisp edges, astronomers suspect that Chariklo also has at least one moon, though none have yet been discovered. More… Discuss

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