Radiation
All radiation travels at this speed.
What is the speed of light?
True or False: The Moon is younger than the Earth
True
Novae and/or Type Ia Supernova
Name the two main types of galaxies
Spiral and elliptical
No light crosses the event horizon.
Light from the Sun makes this kind of spectrum.
Venus and Earth both exhibit this phenomenon.
What is the greenhouse effect
They are at different distances
lighthouse model - not all pulsars' beams will sweep across the Earth
Old galaxies do not have quasars at their centers. Why?
BH ran out of gas to accrete.
Wien's Law relates these two variables
What are peak wavelength (or frequency) and temperature of an object?
True or False: All planets exhibit retrograde motion.
True
This is the efficiency of nuclear burning.
I observe Galaxy Steve. I see lots of nebulae, where new stars are forming. This is the type of galaxy Steve is.
What is a spiral galaxy
These 3 properties completely describe a black hole.
What are mass, electric charge (~0) and spin?
What are ionisation and recombination.
Red giant
Galaxy Bob emits strongly in the radio part of the spectrum. What could be at Bob's center.
A quasar aka. active galactic nuclei
There is a black hole accreting gas at the center of a galaxy. What is this phenomenon called.
The Cosmic Microwave Background is measured in the microwave. What will we measure in 2 billion years.
Longer wavelength radiation e.g. radio
What is Rayleigh scattering?
They are very dark/do not really emit much light so are "dark matter"
This plot for a galaxy tells us galaxies have dark matter.
What is a rotation curve
This phenomenon is why black holes can lose mass.
Virtual particle pair production (evaporation of black holes)