General Relativity
Black Holes
The Universe
Galaxy Classes
Star Formation
100
Einstein's theory of gravity
What is General Relativity?
100
The distorted shape a black hole makes in spacetime
What is a singularity?
100
Collection of stars, gas and dust
What is a galaxy?
100
The galaxy classes.
What are spiral, elliptical, S0 and irregular?
100

Type of galaxy where star formation occurs.

What is spiral?

200
What matter does to the fabric of space
What is distorts?
200
The boundary where light can't escape a black hole.
What is the event horizon?
200
Everything, including billions of galaxies
What is the universe?
200
Football shaped galaxies with a reddish color and very little dust.
What are ellipticals?
200
Color of galaxies actively forming stars?
What is blue?
300
When light is bent by gravity
What is gravitational lensing?
300
Approximate size of a 1 solar mass black hole
What is 3 km?
300
Spiral galaxies with a rectangular shaped central bulge, classified as SB?
What are barred spirals?
300
Color of galaxies with no recent or current star formation?
What is red? (blue stars have evolved and died)
400
Because gravity does this, gravitational redshift changes the wavelength of light
What is slows time?
400
Property of the event horizon of a black hole
What is extreme gravity, nothing can escape, very small?
400
A galaxy classification diagram with ellipticals on the handle and spirals on the tines.
What is the Hubble Tuning Fork?
400

Type of stars present in spiral galaxies.

What is all types? Young/old, high/low mass, blue/red

500
The result of small perturbations in spacetime when massive objects interact.
What are gravitational waves?
500
Used to detect black holes in binary systems
What are x-rays or gravitational waves?
500
Galaxies with mixed properties that sit at the junction of the Hubble Tuning Fork?
What are S0?
500

Reason why spiral arms are blue

What is blue stars (hot, young, O & B type)? Stars are forming there.

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