Hierarchy
Galaxies
Planets
Motion and Gravity
Vocabulary
100
This contains all of space and everything within that space.
What is the universe
100
The name of the galaxy we live within.
What is the Milky Way
100
The terrestrial planets of our solar system.
What are Mercury, Venus, Earth, and Mars
100
Kepler's first law of planetary motion states that all objects move about the sun in _______ orbits, having the sun as one of the foci.
What is elliptical
100
A gravitationally bound system of stars, solar systems, gas, dust, and dark matter.
What is a galaxy
200
This is larger than a terrestrial planet but smaller than a star. 
What is a gas giant
200
The shape or type of galaxy we live within.
What is a spiral galaxy
200
The gas giant planets of our solar system.
What are Jupiter, Saturn, Uranus, and Neptune.
200
The amount of gravity between two objects will ______ as they get closer to one another.
What is increase
200
A large burning ball of gas in space.
What is a star?
300
These objects are smaller than Moons but larger than comets.
What are dwarf planets
300
The three types, or shapes, of galaxies.
What are spiral, elliptical, and irregular.
300
The hottest planet, though it is not the closest to the sun.
What is Venus
300
The distance from the Earth to the Sun
What is one Astronomical Unit (AU), Or 93 million miles
300
A natural phenomenon wherein all things which have mass are pulled together, or attracted, toward one another.
What is gravity
400
This contains all of the gas, dust, and ice that goes on to create a solar system and all of the astronomical bodies within it including stars and planets.
What is a solar nebula
400
These are believed to be at the center of every galaxy.
What are black holes
400
The antiquated idea that Earth was at the center of the universe.
What is the geocentric model of the solar system.
400
Two factors which affect the amount of gravity and object has.
What are mass and distance
400
The oval shape in which objects in space orbit around other objects.
What is an ellipse
500
Write the first letter of the following in order from largest object to smallest object in space.

Galaxy, Solar System (SS), Planet, Universe, Moon, Comet, Solar Nebula (SN).

What is U, G, SN, SS, P, M, C
500
The nearest galaxy to our own.
What is the Andromeda galaxy
500
The scientist who disproved Geocentrism by observing the revolution of moons around Jupiter
Who was Galileo
500
This color change provides evidence to monitoring scientists that the Andromeda galaxy is moving at 68 miles/second towards the Milky Way galaxy.
What is blue shift.
500
A change in the frequency of light waves due to a change in distance between two objects.
What is the Doppler shift. (Or Red Shift/Blue Shift)
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