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A Star is Born

nebula large spiraling cloud of gas and dust
protostar as nebula contracts, a small star is formed
nuclear fusion hydrogen into helium
The life of the star after nuclear fusion is determined by the mass of the star.
Solar System the sun, planets, and many smaller objects that travel around the sun.
A cloud of hydrogen gas, helium gas, and dust particles begins a slow, counterclockwise rotation __________ billion years ago five
planet a body of matter that orbits a star
Solar System Planets orbit the sun in a counterclockwise, elliptical path, all on the same plane
brightness of a star depends on both temperature and size
absolute magnitude actual brightness
apparent magnitude brightness as seen from Earth
The distance between stars is measured in light years
A light year is described as.... the distance that light travels through space in one year
This is the center of our solar system... the Sun
The Sun is a ________ mass star. medium
The ____________ magnitude makes the Sun appear much larger. apparent
The life expectancy of the Sun is about _____ ____________ years. ten billion
Dense materials near the sun condensed to form these small, rocky planets. Mercury, Venus, Earth, and Mars
Gases vaporized and pushed outward to form these huge, gaseous planets. Jupiter, Saturn, Uranus, and Neptune
terrestrial planets inner planets, smaller, close to the sun. Surfaces are made up of solid rock, few moons, no rings
jovian planets outer planets, larger, further from the sun. composed mainly of gases, many moons and rings
rotation length of time it takes a planet to spin on its axis. creates "night" and "day"
revolution/orbit movement of a planet on a fixed path around the sun, counter-clockwise direction
motions of the moon orbits and rotates at the same speed. SAME side of the moon always faces Earth.
Sun, Earth and Moon moon reflects the light of the sun, does NOT make its own light. takes 29.5 days to go through a full phase cycle.
solar eclipse The Sun is blocked. Occurs when the Moon passes directly between Earth and the Sun, casting a shadow on Earth and blocking our view of the Sun.
lunar eclipse The Moon is blocked. Occurs when the Moon moves through the shadow of Earth during a full moon.
phases of the moon new moon, new crescent, first quarter, new gibbous, full moon, old gibbous, last quarter, old crescent
asteroids metallic, rocky bodies without atmospheres that orbit the Sun. mostly found between Mars and Jupiter, and after Neptune.
comets orbit the sun in highly elliptical paths-can take up to two million years to complete one orbit. composed of a coma (icy core) and a tail (gas molecule)
meteoroid chunks of matter in space whose orbits cross the orbits of the planets
meteor a meteoroid that enters the Earth's atmosphere, vaporizes, and gives off streaks of light (shooting star)
meteorite any meteoroid matter that survives the atmosphere and strikes the ground
Created by: osterman