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Meteoroids are objects in space that range in size from dust grains to small asteroids. Think of them as “space rocks."

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When a meteoroid survives a trip through the atmosphere and hits the ground, it’s called a meteorite.
This the picture of a meteorite which was hit on the earth.It is called Gibeon.

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When meteoroids enter Earth’s atmosphere (or that of another planet, like Mars) at high speed and burn up, the fireballs or “shooting stars” are called meteors

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Comets are cosmic snowballs of frozen gases, rock, and dust that orbit the Sun. When frozen, they are the size of a small town. When a comet's orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets.

The dust and gases form a tail that stretches away from the Sun for millions of miles. There are likely billions of comets orbiting our Sun in the Kuiper Belt and even more distant Oort Cloud.

The current number of known comets is:

3,738

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Most meteors occur in Earth’s mesosphere, about 50-80 kilometers (31-50 miles) above the Earth's surface.

Even the smallest meteors are visible from many kilometers away because of how fast they travel and how brightly they shine. The fastest meteors travel at speeds of 71 kilometers (44 miles) per second.

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The faster and larger the meteor, the brighter and longer it may glow. The smallest meteors only glow for about a second while larger and faster meteors can be visible for up to several minutes. Although thousands of meteors fall during the day, meteors are best observed at night, when the streaks of light are visible in the dark sky.