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Galaxies Flashcards

Galaxies, stars & the solar system

TermDefinition
what are stars A star is an object made up of gas and it is luminous
Why are stars luminous Stars are luminous because it is a result of nuclear reactions
What are nuclear reactions nuclear reactions occur between two hydrogen atoms
what are the four phases of a star phase 1 - formation phase 2 - the stable period phase 3 - the red giant phase 4 - the white dwarf
phase 1 - formation There are large gas clouds in space, called nebulae.
what is an nebulae singular nebula
phase 2 - the stable period over billions of years the star becomes stable.
Phase 3 - the red giant when the star has used up all its supplies of hydrogen in its core, it begins burning helium on its outer parts
phase 4 - the white dwarf once the red giant has turned all the hydrogen that it contains both in its core and on its surface to helium
What is a Galaxy A galaxy is a collection of millions or billions of stars, along with gas and dust all held together by gravitational forces
what are gravitational forces it is the force that keeps the earth from flying away from the sun
Our Solar System our solar system is made up of the Sun and the planets that orbit around it
What are Planets to be called a planet three conditions must be met
what are the three conditions must be met 1. The object must orbit a star such as our sun 2. The object must be big enough to allow its own gravity to pull it inwards to make it look like a sphere 3. the object must be big enough to allow its own gravity to move other objects around it
what are the Terrestrial Planets the solar system's terrestrial planets are: Mercury, Venus, Earth, and Mars
What are the Jovian Planets the Jovian planets are the gas giants in our solar system: Jupiter, Uranus, Saturn, and Neptune
what are planetoids A planetoid is a dwarf planet. These objects that are: Too large to be asteroids and too small to be planets an example is Pluto
How do Planets orbit Planets orbit around the sun which is the major point of gravitational pull
Created by: 20OMcCormack
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