astronomy final

what is the galaxy in which our solar system is called

Milky way
cosmology

study of structure and evolution of the universe
rotation curve

plot of rotation speed vs. distance
differential rotation

inner parts rotate faster then outer parts
how to calculate the mass of the galaxy

the rotational velocity & the combined gravitational effect of all mass
Sag A

a galactic center black hole
the cepheid variable

measures distance to other galaxies
the redshift and expansion was a measure of

radial velocity
The more distance a galaxy....

the faster it is receding
Hubble Constant

70 km/sec per mpc
hubble law

the relation of the distance of a galaxy to its recessional speed
recessional velocity equals

H x D
diagram that organizes different galaxy types

tuning fork shaped diagram
E0

almost perfectly spherical
E7

quite flattened
SA

tightly wound and lrg central bulge
Sd

loosely wound and have small central bulge
barred spirals are labeled

SBa-SBd
dark mass

missing mass
all known matter interacts with

wavelength of electromagnetic radiation.
MACHO

massive, compact halo objects
WIMPS

Weakly interacting massive particles.
cosmological principle

lack of a preferred location in the universe
age of the universe is

14 billion years
galaxies move relative to space

gravity can accelerate one galaxy to another faster then space expands.
everytime we look at sky,

we are looking back in time
cosmic microwave background

the light from the early universe
after the big bang what element existed

helium
inflation

when the universe expanded from less than the size of a proton to the size of a basketball
what is inertia

tendency of an object to stay in constant state of rest or uniform motion
why is the gravitational force greater at the poles

because the earth's diameter is greater at the equator

Author

Anonymous

ID

21874

Card Set

astronomy final

Description

FUCKEN IRKING SHIT

Updated

2010-06-03T07:51:13Z

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