When will it come back? ☄️
—a name that designates a comet with an orbit that lasts less than two centuries. The period varies because of the gravitational effects of the planets. Halley's period has been as short as 74.42 years and as long as 79.25 years.Scientists estimate that Halley has been in its present orbit for at least 16,000 yearsIts current mass is estimated at around 2.
Some researchers have estimated that Halley's comet may have described 2,000 to 3,000 orbits already. Since the average periodic comet is theorized to t aphelion in 1948, Halley was moving at just 0.91 km/sec . However, as comets get closer to the sun, their speed increases. By the time of perihelion in 1986, Halley's was traveling at approximately 122,000 mph. That is 54.55 km/sec relative to Earth's movement.
Halley's dimensions are about 9.3 by 5 miles . It is one of the darkest, or least reflective, objects in the solar system. It has an albedo of 0.03, which means that it reflects only 3% of the light that falls on it.-rich dust. On the comet's last flyby, about 70 percent of the surface of the nucleus was covered by a dark insulating “crust” that prevented the water ice underneath from.
Some have suggested that a comet seen in Ancient Greece between 467 and 466 BCE may have been Halley. Babylonian records found on ancient clay tablets reveal what may have been sightings in 164 B.C. and 87 B.C. Halley may also have been the comet described by Roman historian Dion Cassius as a “fearful star” in 218 CE. In fact, the appearance of comets, in general, was often treated as deadly omens.
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