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
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 >
Meteors from Mars arrive on Earth as the result of impacts on the planet by other bodies, which launch material out into space. Some of this debris is pulled in by the gravity of the Earth, falling as Martian meteorites.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 >
Scientists predict that Halley's Comet, also known as Comet Halley, will make an appearance again in late 2061, early 2062. It was last seen in the sky in 1986.Full Answer >