Comets
⭐ MasteredA comet is a ball of ice, dust and rock that grows a glowing tail when it nears the Sun. Halley's Comet returns about every 76 years.
A comet's tail always points away from the Sun.
All about Comets
A comet is a small body made of ice, dust and rock that orbits the Sun. When a comet gets close to the Sun, the ice heats up and releases gas and dust, which form a glowing coma and a long tail that always points away from the Sun.
Comets are often called dirty snowballs. Most comets orbit far beyond the planets, but some travel in closer orbits. Halley's Comet returns about every 76 years and was last seen in 1986.
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Real-life uses of Comets
- Studying the early Solar System, since comets are very old
- Learning about the water and organic materials that may have reached Earth
- Inspiring observers to watch the night sky
Frequently asked questions about Comets
Why do comets have tails?
The Sun's heat releases gas and dust from the comet, and solar wind pushes the material into a tail pointing away from the Sun.
What is the difference between a comet and an asteroid?
Comets are icy and develop tails near the Sun. Asteroids are rocky and usually stay in orbits without tails.
When will Halley's Comet next be visible?
It is expected to return around 2061.