F- Distinguish between them?
Q-What is the difference between
a star and a galaxy?
Answer-A galaxy is a
collection of stars. There can be billions of stars in a galaxy. All the stars
you see at night, along with our sun, are all in the Milky Way galaxy.
Constellation & galaxy -
A constellation is an apparent cluster of stars, while a galaxy is a real
cluster of stars.
Comet - A body of ice, rock
and dust that can be several miles in diameter and orbits the sun. Debris from
comets is the source of many meteoroids.
Meteoroid - A small rocky or
metal object, usually between the size of a grain of sand or a boulder that
orbits the sun. It originates from a comet
or asteroid.
Meteor - A meteoroid that
enters the earth’s atmosphere and vaporizes. Also called a “shooting star.”
Meteorite - A meteor that
hits Earth without burning up in the atmosphere.
Moon / Satellite - A body
orbiting a planet.
Planet - A body orbiting a star.
Star - A ball of burning gas
(Hydrogen & Helium). Every second, 600 million tons of hydrogen is being converted
into helium. This reaction releases a tremendous amount of heat and energy.
Solar System - A collection
of planets and satellites orbiting a star or stars.
Galaxy - A collection of stars.
Universe – Everything (including
Space, Time, matter & Energy) is called Universe.
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