a large group of stars, gas, and dust held together by gravity.
space conataining all known matter and energy.
the distance light can travel in one year.
Steady State Theory
states that the universe has always been the same as it is now.
states that the universe began with expansion.
Big Bang Theory
states that approximately 13.7 billion years ago and it began with an enormous explosion.
2.2 billion lightyears away
Nickname for the galaxy that contains Earth.
a person who studies space.
center of the sun where the sun's energy is produced by nuclear fusion.
we know this layer an the sun's surface.
this is a deep red layer only visible during eclipses.
hot and cool gases circulate, bringing the sun's energy to the surface.
this layer is so dense that light takes a long time to pass through.
areas of the sun's surface that appear darker than the surrounding surface because they are cooler.
huge arching colums of gas.
bright, violent eruptions of gas shooting outward from the sun.
occur when large amounts of electrically charged gas are ejected suddenly from the sun.
a large mass of spherical mass of gas that gives off light.
measure of the actual amount of light a star gives off.
measure of the amount of light recieved on earth.
stars create a diagonal band across the H-R diagram.
extreamly bright but not extreamly hot
Earth's galaxy is the milky way wich is a part of the ______.
large, three-demensional eclipses; most commen shape.
has spiral arms that wind ot from inner sections.
smaller, less commen galaxies with various different shapes
dying children in ancient Greek language.