Q1. Define the following terms celestial bodies, stars,
constellations, planets, solar system, orbit, satellite, asteroids,
meteoroids, galaxy, universe
Answers
Answer:
Explanation:
Celestial bodies-An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe
Stars-A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth.
Constellations-A constellation is a group of stars that make an imaginary shape in the night sky. They are usually named after mythological characters, people, animals and objects. In different parts of the world, people have made up different shapes out of the same groups of bright stars.
Planets-A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
Solar system-The Sun together with the eight planets, their moons, and all other bodies that orbit it, including dwarf planets, asteroids, comets, meteoroids, and Kuiper belt objects.
Orbit-An orbit is a regular, repeating path that an object in space takes around another one. In our solar system, the Earth orbits the Sun, as do the other eight planets. They all travel on or near the orbital plane, an imaginary disk-shaped surface in space. All of the orbits are circular or elliptical in their shape.
Satellite-a celestial body orbiting around a planet or star the earth is a satellite of the sun. Also called: artificial satellite a man-made device orbiting around the earth, moon, or another planet transmitting to earth scientific information or used for communication.
Asteroids-An asteroid is a large, irregularly shaped object in space that orbits our Sun. If one of these giant rocks ends up on a collision course with Earth, we are in for big trouble. An asteroid is like a comet.
Meteoroids-A meteoroid is a small space rock moving through a solar system. ... If part of that meteor survives the trip through the atmosphere and hits the Earth, it's a meteorite. A lot of meteoroids never end up being meteors or meteorites.
Galaxy-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.
Universe-The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time.The Universe contains billions of galaxies, each containing millions or billions of stars. The space between the stars and galaxies is largely empty.