what is a star? what is a planet?what is orbit? which are the other planets? which planet is known as Red planet ? what are satellite? what are comets? what are meteors? what are meteorites? what are asteroids?
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Solar System ExplorationSkip Navigation
Asteroids, Comets & Meteors
At the very beginning of our solar system, before there was an Earth, Jupiter or Pluto, a massive swirling cloud of dust and gas circled the young Sun. The dust particles in this disk collided with each other and formed into larger bits of rock. This process continued until they reached the size of boulders. Eventually this process of accretion formed the planets of our solar system.
Billions of small space rocks never evolved. Amazingly, many of these mysterious worlds have been altered very little in the 4.6 billion years since they first formed. Their relatively pristine state makes the comets, asteroids and some meteors wonderful storytellers with much to share about what conditions were like in the early solar system. They can reveal secrets about our origins, chronicling the processes and events that led to the birth of our world. They might offer clues about where the water and raw materials that made life possible on Earth came from.
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Explanation:
- A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity
- A very large round object in space that moves around the sun or another star
- A curved path taken by a planet or another object as it moves around another planet, star, moon,etc..
- Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
- MARS
- A satellite is an object that has been intentionally placed into orbit.
- Comets are basically dusty snowballs which orbit the Sun. They are made of ices, such as water, carbon dioxide, ammonia and methane, mixed with dust.
- A meteor is a meteoroid – or a particle broken off an asteroid or comet orbiting the Sun – that burns up as it enters the Earth's atmosphere, creating the effect of a "shooting star".
- Meteoroids that reach the Earth's surface without disintegrating are called meteorites.
- An asteroid is a small rocky object that orbits the Sun. Asteroids are smaller than a planet, but they are larger than the pebble-size objects.