Comet

常见问题

• Is there a comet coming in 2022?
  Comet PanSTARRS (C/2017 K2) 19, 2022 — 269 million kilometers (1.8 a.u.) Closest approach to Earth: July 14, 2022 — 271 million kilometers (1.8 a.u.)
• What does comets do?
  Comets are frozen leftovers from the formation of the solar system composed of dust, rock, and ices. They range from a few miles to tens of miles wide, but as they orbit closer to the Sun, they heat up and spew gases and dust into a glowing head that can be larger than a planet.
• What is the current comet in the sky?
  Current Observable Comets
• When was the last time a comet?
  It was last here in 1986, and it is projected to return in 2061. The comet, officially called 1P/Halley, is named after English astronomer Edmond Halley, who examined reports of a comet approaching Earth in 1531, 1607 and 1682.