The Big Bang
This event, which occurred about 13.8 billion years ago, is believed to have marked the beginning of the universe.
What is the Big Bang?
This force, which attracts objects towards each other, is responsible for keeping planets in orbit around the sun.
What is Gravity?
This planet is the closest to the sun and has a surface temperature that can reach over 800°F.
What is Mercury?
These two planets are the closest in size to each other.
What are Venus and Earth?
Our star is this color and size.
Yellow, small/medium.
Edwin Hubble first proposed that galaxies are _, supporting the theory of the Big Bang.
What is "moving away from each other"?
The path a planet takes around the sun is known as this.
What is an orbit?
This planet is closest in size to Earth.
What is Venus?
This is the smallest planet.
What is Mercury?
When our star reaches the end of its main sequence, it will become this.
What is a red giant?
The Big Bang Theory suggests the universe began as this.
What is a single point?
According to this scientist’s law, the force of gravity decreases as the distance between two objects increases.
Who is Newton?
These four planets are rocky and closest to the Sun.
What are Mercury, Venus, Earth, and Mars?
This is the largest planet.
What is Jupiter?
Very large stars, at the end of their main sequence, may explode into this.
What is a supernova?
This is how long it took for the first light to shine in the universe.
What is 300,000 years?
According to Einstein, orbits are circular because heavy objects do what to space?
What is stretch or warp it?
What are Jupiter, Saturn, Uranus, and Neptune?
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
If a star is large enough, it will eventually create this, a space so dense even light can't escape it.
What is a black hole?
This element, making up about 75% of the observable universe, was one of the first to form after the Big Bang.
What is hydrogen?
What is...
1. It will collide with the Sun.
OR
2. It will escape from the Sun's gravity.
These two planets are the true "gas giants", since they are the largest and mostly made of hydrogen gas.
What are Jupiter and Saturn?
List the planets in size order, from largest to smallest.
Jupiter
Saturn
Uranus
Neptune
Earth
Venus
Mars
Mercury
Most small stars will eventually become this type of star, meaning very small, which comes in several colors.
What is a dwarf star?