The Planets
The planet has 3:2 orbital resonance around the Sun.
Mercury
This is the closest star to Earth.
The Sun
This measurement of a star is its apparent magnitude at 10 pc.
absolute magnitude
This is a gargantuan collection of stellar and interstellar material.
A Galaxy
This is the study of the structure and evolution of the universe.
Cosmology
This planet is knocked over on it's side.
Uranus
The Sun is this far away from Earth.
93 million miles/1AU
The hottest stars are this color...
Blue/white
This is our Galaxy.
The Milky Way Galaxy
This term means that the universe is the same in all directions.
isotropic
This is the only planet NOT visible to the naked eye and was first predicted by Math.
Neptune
What is the Sun's age?
the coolest stars are this color...
red/brown
Name the three parts of our Galaxy, structurally.
disk, bulge, halo
This term means that the Universe is made up of the same stuff everywhere we look...the mixture is always the same.
homogeneous
This planet spins in the opposite (clockwise) direction compared to the rest of the planets. It also has the longest rotation in the Solar System.
Venus
How long does it take for the Sun to rotate on its axis (+/- 3)?
27 days
What are the spectral classes of stars, in order, starting with the hottest "O" stars:
OBAFGKM
This portion of the galaxy is the youngest part of the galaxy and the site of loads of star formation.
the galactic disk
If everything is the same everywhere and all that space is full of stars and galaxies, why is dark at night? This is the main problem that we call _________ paradox.
Olber's
This is the only planet that could float in a pool of water due to it's density being less than that of water.
Saturn
How long is a solar cycle? (period of two sunspot cycles...most to least to most active)?
22 years
This Diagram, named for two scientists, plots stars based on their Luminosity vs their Surface Temps.
H-R Diagram
What specifically is at the center of our Galaxy?
Sgr A* (saj A star)
This theoretical equation lets us speculate as to how many technologically intelligent civilizations there should be in the universe.
the Drake Equation