Question

1. WHY DO WE SEE ONLY ONE SIDE OF THE MOON ALWAYS? 2.WHAT ARE SATELLITES? 3.WHAT IS A GALAXY? 4.WHAT IS THE SIGNIFICANCE OF THE SUN IN OUR SOLAR SYSTEM? 5. DIFFER BETWEEN ASTEROIDS AND METEOROIDS.

Answer 1

1. One side of the moon always faces Earth because of what's called synchronous rotation. ... Because of synchronous rotation or tidal locking, our moon rotates on its axis in the same period that it revolves around the Earth: 27.32 days.
2. In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such as Earth's Moon. On 4 October 1957 the Soviet Union launched the world's first artificial satellite, Sputnik
3. A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle. ... This is the picture taken by the Hubble Space Telescope showing thousands of galaxies.
4. Compared with the billions of other stars in the universe, the sun is unremarkable. But for Earth and the other planets that revolve around it, the sun is a powerful center of attention. It holds the solar system together; provides life-giving light, heat, and energy to Earth; and generates space weather.
5. 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 we call meteoroids. ... A meteor is what happens when a small piece of an asteroid or comet, called a meteoroid, burns up upon entering Earth's atmosphere.

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