Halley's comet takes 76 years to pass by Earth. This comet is an example of a short-period comet, one whose orbit is influenced by the gravities of the outer planets of the solar system and so usually stays within the area of the planets.Know More
Halley's comet comes as close to the sun as 88 million kilometers, which is closer than the orbit of Earth. Its farthest distance from the sun is 5.2 billion kilometers, which reaches even beyond the orbit of Neptune.
Edmund Halley used Isaac Newton's theory of gravitation to conclude that the comets that made appearances in 1531, 1607 and 1682 were actually the same comet. He then used the theory to predict that this same comet would appear again in 1742, and it did, although Halley did not live to see the comet's reappearance.Learn more about Comets & Asteroids
Ukrainian scientists discovered a large asteroid in late 2013 that could possibly strike the Earth on Aug. 26, 2032. If such a collision occurred, it would strike with a force 50 times greater than the largest atomic bomb.Full Answer >
According to the Lunar and Planetary Institute, the nucleus of a comet is usually 1 to 10 kilometers across, and the tail stretches tens of millions of kilometers. A comet’s nucleus is a stable, porous mass of dust, ice and gas.Full Answer >
The famous comet that returns to our night sky every 76 years is called Halley's comet, or Comet Halley. However, 76 years is an average time for Halley's return; gravitational perturbations and nongravitational effects such as offgassing on solar approach also influence when exactly Halley's comet will show up.Full Answer >
Halley's Comet has an average diameter of 11 kilometers and a mean density of 0.6 grams per cubic centimeter. The length of each rotation is equivalent to 2.2 Earth days.Full Answer >