EARLY ASTRONOMERS
INNER PLANETS
OUTER PLANETS
OTHER BODIES IN SPACE
FORMATION OF THE SOLAR SYSTEM
100
In the geocentric system of the ancient Greeks, all objects in space revolved around this.
What is the Earth?
100
The third planet from the sun
What is Earth?
100
It has the most notable ring system made of pieces of rock and ice
What is Saturn?
100
Bodies of rock, ice, and gas with varied orbits around the sun
What are comets?
100
A force that causes interstellar material to come together to form stars
What is gravity?
200
A Polish astronomer in the 1500s who developed a Sun-centered model of the solar system
Who is Nicolaus Copernicus?
200
The nearest planet to the sun
What is Mercury?
200
The largest planet characterized by the Great Red Spot
What is Jupiter?
200
Most of these rocky bodies are located in a belt between Mars and Jupiter
What are asteroids?
200
Most material in arotating cloud of gas and dust gathers in the center, compresses and forms this
What is a star?
300
An Italian astronomer who discovered Jupiter's four largest moons
Who is Galileo Galilei?
300
A lot of iron in the soil gives this planet a reddish color
What is Mars?
300
This outermost planet is smaller than the Earth's moon
What is Pluto?
300
A streak of light also called a shooting star, made when a frament passes through Earth's atmosphere
What is a meteor?
300
A cloud of dust and gas that forms stars and planets
What is an interstellar cloud?
400
A German mathematician who discovered that the orbit of each planet is an ellipse
Who is Johannes Kepler?
400
Thick, yellowish clouds block our view of this planet's surface
What is Venus?
400
Instead of being rocky worlds, the four largest planets are made of these
What are gases?
400
The part of a meteor that doesn't burn up in the atmosphere
What is a meteorite?
400
Two main gases in interstellar clouds
What are hydrogen and helium?
500
A Danish astronomer who made the most complete astronomical observations before the telescope was invented
Who is Tycho Brahe?
500
Its surface is heavily cratered like Earth's moon
What is Mercury?
500
The axis of this planet is tipped almost parallel to its orbital plane
What is Uranus?
500
A cloud of gas that forms around the nucleus of a comet
What is the coma?
500
The name of the most widely accepted model of how our solar system formed
What is the Nebular hypothesis?
M
e
n
u