The Universe
A large spherical body that orbits a star
What is a planet?
The reason we use light years to measure distances in space
What is the distances in space are too large?
The sun is this size compared to other stars
What is average?
Stars are made of this phase of matter
What is gas/plasma?
Scientists used to think this was the center of the universe in the geocentric model until it was disproven by new data
What is the Earth?
What are the gas planets?
The term we use for the distance between Earth and the Sun
What is an astronomical unit?
The term for how bright a star actually is
What is absolute brightness or luminosity?
The center of the sun where nuclear fusion happens
What is the core?
The force that holds the universe together and led to the formation of planets and stars
What is gravity?
This is similar to an asteroid but is much smaller
What is a meteoroid?
The reason humans cannot travel to other stars using current technology
Sirius has a lower this than the sun, despite being both hotter and larger than the sun.
What is apparent magnitude?
A loop of relatively cool gas that comes from a star
What is a prominence?
A star which can be 1,000s of times bigger than the sun
What is a supergiant?
A group of stars and nebulae that are held together by gravity, often orbiting a black hole
What is a galaxy?
Astronomical units are often used to measure distances in this
What is the solar system?
The process where hydrogen is built into helium, releasing tremendous amounts of energy
What is nuclear fusion?
The layer of the sun which we see when we look at the sun
What is the photosphere?
The layer of the sun where hot gas rises and cooler gas sinks, transferring energy
What is the convection zone?
The shape of the milky way galaxy
What is a spiral?
One light year is approximately this distance
What is 9.46 trillion kilometers?
Betelgeuse is a red supergiant star, and Rigel is a blue giant star. This is the temperature AND absolute magnitude of Rigel compared to Betelgeuse.
What is hotter and brighter?
This part of the sun rotates the fastest
What is the equator/middle?
The correct order, from smallest to largest, of the following celestial bodies: Asteroid, planet, Sun-sized star, Red supergiant star, White dwarf star, meteoroid, moon
Meteoroid, Asteroid, Moon, Planet, White Dwarf star, Sun-sized star, Red supergiant star