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Study Guide for Astronamy

Rotation The action of turning or spinning on an axis
Revolution The action of one object moving completely around another in an orbital path.
Most common element in the universe Hydrogen the Helium
Light year The distance light travels in a year. About 5.88 trillion miles
Waxing Between the new moon and the full moon.
Waning After the full moon and is when their is a shadow on the right side.
Which side is the moon lit up on during the waxing phases? Right
Which side is it lit up on during the waning phases? Left
Be able to identify moon phases on a diagram New moon, Waxing crescent, First quarter, Waxing Gibbous, Full moon, Waning Gibbous, Third Quarter, Waning Crescent
Moon’s revolution period It take the moon 27.3 day to revolve around the earth
How long does it take for the moon to go from new moon to full moon? 15 days
Terrestrial Planet Four innermost planets in the solar system Mercury, Venus, earth, Mars. They have rocky or solid surfaces and are smaller
Gas Planet Jupiter, Saturn, Uranus, and Neptune. Do not have rock or solid surfaces and are bigger.
Inner Planet Mercury, Venus, Earth, Mars. Also known as the terrestrial planets.
Outer Planet Jupiter, Saturn, Uranus, Neptune. Also known as Gas planets
Asteroid A large potato object that orbits the sun, smaller then planets
Asteroid Belt Between the orbits of Mars and Jupiter. Most asteroids are located there.
meteors, meteoroids, and meteorites Meteors are meteoroids that have entered the atmosphere. Meteoroids are pieces of asteroids Meteorite is a meteor that hit earths surface
3 Parts of a Comet Nucleus, Coma, and Tail
Which direction does the Tail point towards Always points away from the sun.
What causes the tail of a comet? Gas and dust pushed away from the comet due to solar winds. Can be millions of kilometers long
Photosphere Visible surface of the sun.
Corona 3rd and hottest layer of the sun
Solar wind Carries particles out from the sun
Sunspot Coolest parts of the sun. It looks like a dark spot
Source of Sun’s energy Nuclear Fusion
Absolute magnitude vs. Apparent magnitude Absolute magnitude is how bright the star seems to be at a standard distance 32.6 light years. Apparent magnitude is how bright the star appears from the earth.
90% of the stars on an H-R diagram are ______________ ______________ stars. main sequence
Main sequence Ranges from hot and bright. To dim and cool
Red Giant The stage after main sequence for a small to medium star. Fuel begins to run out.
Red supergiant A star that is among to most massive and brightest of all stars
Supernova An extremely bright explosion of a star
Black Dwarf A dead star that no longer gives of light or heat.
Black Hole A gravitational field so strong that not even light can escape
What causes stars to have a different life cycle It is based on their mass
A protostar must start what process to be considered a star Nuclear fusion( light and heat produced)
Milky Way The name of the spiral shape galaxy in which we live
Elliptical A smooth circular or oval shaped galaxy.
Spiral A flat disk shaped galaxy. Most abundant type about 72% of galaxies are spiral
Irregular A random seatered type of galaxy
What is at the center of a galaxy A massive black hole
Why are their 42 things to study on this page It's the meaning of life
Created by: mdinakin
Popular Science sets




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