Universe Origins
This scientific theory explains that the universe began from an extremely hot, dense state and expanded.
The Bing Bang
Our Solar System began as a giant cloud made mostly of these two materials
Gas and Dust
These are the only two planets in our Solar System that have no moons.
Mercury and Venus
A small rocky or metallic object traveling through outer space is called this.
Meteoroid
This force keeps Earth and the other planets attracted to the Sun.
Gravity
This includes all matter, energy, space, time, galaxies, stars, planets, and everything else that exists.
What is the universe?
This force caused the original solar nebula to collapse inward.
What is gravity?
These two planets are known as the ice giants.
Uranus and Neptune
When that object enters an atmosphere and creates a glowing streak, the glowing event is called this.
Meteor
This tendency of an object to continue moving in the same direction helps keep a planet moving forward in its orbit.
Inertia
This force caused early clouds of gas and matter to collect together, eventually helping form stars and galaxies
What is gravity?
As the collapsing cloud spun faster, it flattened into this shape around the forming Sun.
A Disk
This chemical compound gives Mars much of its reddish color.
Iron Oxide
If part of the object survives and reaches the ground, it is called this.
Meteorite
A planet stays in orbit because gravity pulls inward while this keeps it moving forward.
Inertia
During the early universe, it was extremely hot and dense. As the universe expanded, it began to do this, allowing matter to form more easily
Cool Down
The hotter inner Solar System favored planets made mostly from these two types of materials.
Rock and Metal
Venus is hotter than Mercury even though Mercury is closer to the Sun because Venus has this.
A thick carbon dioxide atmosphere that traps heat
This region located mainly between Mars and Jupiter contains large numbers of rocky objects orbiting the Sun.
Asteroid belt
If the Sun's gravitational pull became much weaker, Earth's forward motion could cause its orbit to do this.
Become much larger or allow Earth to move away from the Sun?
Put these in order: planets form, atoms form, Big Bang, stars and galaxies form, early particles form
What is Big Bang → early particles → atoms → stars and galaxies → planets?
If dust grains in the early Solar System never collided or stuck together, this major process would be greatly reduced.
The formation of planets and larger bodies.
Scientists discover a giant planet made mostly of hydrogen and helium with rings and many moons. This is its most likely classification
Gas giant
Unlike most asteroids, these objects contain large amounts of ice and dust and can develop glowing comas and tails near the Sun.
Comets
Scientists believe this giant planet's powerful gravity disturbed material between Mars and itself and helped prevent the formation of another full-sized planet
Jupiter