Planets
What is the only planet that we know of that holds life?
Earth
How long ago was the solar system formed?
4.6 billion years.
What is the name of our galaxy?
The Milky Way.
The universe is made of clusters, and super-clusters of galaxies pulled together by _______.
Gravity.
The force that binds the planets in our solar system to the Sun.
What is gravity.
What do planets orbit?
The sun
What do moons orbit?
planets
A galaxy is a huge collection of _______, _______, and _______ bound by the force of gravity.
Stars, gas, and dust.
What theory is the most accepted explanation for how the universe formed?
The Big Bang
Pluto is what type of celestial body?
Dwarf planet
The closer a planet is to a star, the faster it ______.
Revolves
The solar system formed from a cloud of gas and dust that pulled together due to the force of _______.
Gravity
Name the three types of galaxies.
Elliptical
Irregular
Spiral
The Big Bang theory states that the universe began from one point and has been ________ and _______ ever since.
Expanding and cooling
Where is the asteroid belt located?
Between Mars and Jupiter
Name the inner planets.
Mercury, Venus, Earth, and Mars.
Name a characteristic of the inner planets.
Closer to the sun.
Made of rock.
Smaller than outer planets.
Revolve around the sun is faster than outer planets.
What is the shape of our galaxy the Milky Way?
Spiral
What is the sequence that describes the structure of the universe from smallest to largest: Galaxy, universe, planet, and solar system.
Planet, solar system, galaxy, universe.
What is the difference between an asteroid and a meteoroid?
Asteroid: a large rocky body in space, in orbit around the Sun.
Meteoroid: much smaller rocks or particles in orbit around the Sun.
Meteor: If a meteoroid enters the Earth's atmosphere and vaporizes, it becomes a meteor, which is often called a shooting star.
Name the outer planets.
Jupiter, Saturn, Uranus, and Neptune.
Name a characteristic of the outer planets.
Farther from the sun.
Made of gas.
Larger than the inner planets.
Slower to revolve around the sun.
What is at the center of our galaxy?
Super massive black hole.
What is a black hole?
a region of space having a gravitational field so intense that no matter or light can escape.
How long does it take light from the sun to reach Earth?
8 minutes