define these terms : stars , nebula, universe?
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Answer:
A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. ... Many other stars are visible to the naked eye from Earth during the night, appearing as a multitude of fixed luminous points in the sky due to their immense distance from Earth.
nebula is a formation in space which is constituted mostly of helium, dust, and other gases in various concentrations. A nebula is also believed to be one of the primary stages in the formation of stars.
The universe (Latin: universus) is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. ... At the largest scale, galaxies are distributed uniformly and the same in all directions, meaning that the universe has neither an edge nor a center.
Star-A star is a very large ball of bright glowing hot matter in space.
Nebula-any of numerous clouds of gas or dust in interstellar space.
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.