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universe & solar sys

universe & solar system vocab & concepts

QuestionAnswer
rotation the spinning of an object (planet, moon, star) around its axis
orbit the path an object takes as it moves around another object in space
nebula an enormous cloud of gas & dust in space
gas giants are ___ (more/less/equally) dense compared to the terrestrial planets less
the planet with the most mass Jupiter
the least dense planet Saturn
the planet that supports life Earth
the hottest planet Venus
planet(s) with rings all gas giants
planet(s) with no moons Mercury & Venus
What is the key difference between asteroids & meteoroids? size
What is the key difference between meteoroids, meteorites & meteors? location
A ___ is a small rocky object in space. meteoroid
If a small, rocky object from space enters Earth's atmosphere, it is called a ___. meteor
Earth's days are a product of Earth's ___. rotation
A year is the amount of time required for Earth to ___. revolve (around the Sun)
How many planets revolve around the Sun? 8
The amount of gravitational force between two objects is dependent on the ___ and ___. mass & distance
What force(s) keep one object in orbit around another object? gravity & inertia
If the Moon were to stop its forward motion (lose inertia), what would happen? It would fall into the Earth!
the object in the solar system with the greatest mass the SUN! (99% of the solar system's mass!)
the astronomer who found evidence in support of the heliocentric model Galileo
the astronomer who discovered the orbits of the planets Kepler
Which model of the universe places Earth at the center? geocentric model
the astronomer who discovered a galaxy beyond the Milky Way Hubble
What key evidence did Hubble discover that supported the big bang theory? galaxies are moving away from each other
A "shooting star" is another name for a ___. meteor
the glowing atmosphere surrounding the nucleus of a comet coma
A comet's tail forms as it gets near ___. the Sun
If the Sun magically lost its gravitational force, what would happen to the Earth? It would fly off into space in a straight line!
location of the asteroid belt between the orbits of Mars & Jupiter
Which is larger, asteroids or meteoroids? asteroids are bigger
Dozens of ___ enter Earth's atmosphere every day. meteoroids (they are meteors if they are IN Earth's atmosphere)
Which planet once had liquid water and now has polar ice caps? Mars
The geocentric model described by ___ and ___ was accepted for thousands of years. Aristotle (the Greeks) & Ptolemy
What were the two key pieces of evidence that Galileo discovered that disproved the geocentric model? moons of Jupiter & phases of Venus
Why does the Moon orbit the Earth if the Sun has more mass than Earth? the Earth is closer to the Moon
gas giants in smallest to largest order Neptune, Uranus, Saturn, Jupiter
How is Uranus different from the other planets? It has a 90 degree axis tilt.
Which astronomer is credited with developing the heliocentric model? Copernicus
Kepler found that the planets' orbits are ___, not circular. elliptical
The Milky Way is a ___ galaxy. spiral
Which formed first, the universe or the solar system? universe
What event started the formation of the universe? big bang
A spiral galaxy can be modeled with a ___. pinwheel
Describe the location of the solar system in the Milky Way galaxy. solar system is on the outer portion of one of the spiral arms (Orion Arm)
Created by: cgottlieb
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