Sun
Most evident form of solar radiation
True / False: All pulsars are neutron stars.
True
spiral, elliptical, irregular
Approximately 14 billion years
Planetary Orbits
Johannes Kepler
A sunspot cycle happens every
11 years
How we identify the distance to nearby stars
Stellar parallax
3 common active galaxies
25% helium that is evident everywhere is called _______________
Primordial helium
Expanding universe
Edwin Hubble
Corona
Which step does a star land on the "main sequence"?
Step 7
Hubble's Law
Two key ideas of the cosmological principle
homogeneous, isotropic
H-R diagram
Harvard Computers
When the heat's push counteracts gravity's pull
hydrostatic equilibrium
In three stages, how does the core of a standard star change over time?
Hydrogen, Helium, Carbon
The galactic result of two galaxies colliding
starburst galaxy
The raditation at the very beginning of the universe is evident as ____________
Cosmic Microwave Background
Size and shape of Earth
Solar constant
1400 W/m2
How we identify the temperature/luminosity of a star
spectral lines/spectroscopy
The outer, less dense, random-motion part of a galaxy
halo
Grand Unified Theory refers to the unification of __________
The four fundamental forces
Speed of light
Ole Romer