What are comets made of?
Comets are cosmic snowballs of frozen gases, rock, and dust. They have a nucleus, a coma, and often two tails, making them icy, dusty bodies.
How do comets form their tails?
As a comet approaches the Sun, solar radiation vaporizes its ice, creating a glowing coma and two distinct tails: a dust tail and an ion tail, pushed away by solar wind.
Why do comets orbit the Sun?
Comets orbit the Sun due to the Sun's gravitational pull. They follow highly elliptical paths, spending most of their time in the outer solar system before returning.
Where do comets originate from?
Comets originate primarily from two regions: the Oort Cloud, a vast spherical cloud far beyond Neptune, and the Kuiper Belt, a disk-shaped region beyond Neptune's orbit.
Can comets pose a threat to Earth?
Yes, comets can pose a threat, though impacts are rare. Large impacts could cause widespread devastation, as evidenced by Earth's geological history of past events.
What is the difference between a comet and an asteroid?
The main difference is composition. Comets are icy and dusty, forming a coma and tails near the Sun, while asteroids are primarily rocky or metallic and lack these features.
How often do comets visit the inner solar system?
The frequency varies greatly. Short-period comets return every few years to decades, while long-period comets can take thousands or even millions of years to complete an orbit.
Why are comets sometimes called 'dirty snowballs'?
Comets are called 'dirty snowballs' because they are primarily composed of ice (water, methane, ammonia, CO2) mixed with dust and rocky particles, giving them a 'dirty' appearance.
What is the Oort Cloud?
The Oort Cloud is a theoretical spherical cloud of icy planetesimals surrounding the Sun, extending far beyond the Kuiper Belt. It is considered the source of long-period comets.
Can we observe comets from Earth?
Yes, many comets are observable from Earth. Some are visible with the naked eye when they are bright enough and close, while others require telescopes for observation.
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