The universe: galaxies, stars, and the solar system
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38 Terms
What Greek words does Astronomy come from?
“Astro” and “nomos” - “laws of the stars”
What is Astronomy the study of?
Celestial objects and their positions, movements, and structures
What does celestial refer to?
The heavens; sky, space and all that is contained there
What does Astronomy also include about Earth?
The motion of Earth as it moves through space
What is the Sun at the center of?
The Solar System
The sun is 70%
Hydrogen
The sun is 28%
Helium
The sun is 2%
Various metals
How many stars are in the Milky Way Galaxy?
100 billion
The diameter of the Sun - 1,390,000 km, is how many times Earth’s diamter?
109
The sun is how many times the mass of Earth?
330000
How much of the total mass of the Solar System is represented by the Sun?
99.8%
The Sun’s core is how much more denser than water?
150
The surface of the sun is called
The Photosphere
What sphere lies above the photosphere?
The Chromosphere
What part of the sun extends millions of miles into space after the chromosphere?
The Corona
What are sunspots?
Relatively cool regions on the surface of the Sun
The heliosphere is like what surrounding the Sun?
A bubble, and the area affected by the Sun’s particles
Mercury
What is the planet closest to the Sun?
Venus
What planet is between Mercury and Earth?
Mars
What planet is in-between Earth and the asteroid belt?
Jupiter
What planet comes after Mars but is before Saturn?
Saturn
What is farther than Jupiter but is before Uranus?
Neptune
What planet is farthest from the Sun?
How much is an Astronomical Unit?
The distance from the Sun to the Earth
Juptier
What planet is the most massive?
Saturn
What planet is the 2nd largest?
Uranus
What planet is third largest?
Neptune
What planet is the fourth largest?
Earth
What planet is the fifth largest?
Venus
What planet is sixth largest?
Mars
What planet is seventh largest?
Mercury
What planet is the smallest?
What is a meteroid?
A rock in space
What is a meteor?
The streak of light from a meteoroid in the Earth’s Atmosphere?
What is a meteorite?
A meteoroid that reaches the Earth’s surface?
What is a meteor shower?
Higher than normal number of meteors in the atmosphere
What are fireballs?
Very bright meteors with trails that can last as long as 30 minutes
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Flashcards (20)