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Astronomy Galaxies and More

Terms in this set (42)

Diameter of milky way
100,000 light years
Thiccness of milky way
1,000 light years
5 Arms of the milky way
Norma
scrurum- Crux
Sagitarius
orion- cygnus
Perseus
Sun location
Orion cygnus, the spur
number of planets in the milky way
100 billion
number of stars in the milky way
200-400billion
Sun distance from center
26,000 light years
Name of the black hole at the center
Sagitarius A*
Four types of galaxies
Ellipticals
lenticulars
Spheroid
Irregular
Elliptical galaxies are shaped like
a spheroid
Scaled based on ____________ from ____ to ____
Ellipticity 0 to 7
E0 galaxy
Sphere
E7 galaxy
Flat
S
Regular spiral
SB
Barred Spirals
Spiral Classification range
From a to d
Sa or SBa
Tight spiral, Smooth arms, large and bright central bulge
Sd or SBd
Very loose wound arms, arms are fragmented, arms are brighter than the bulge
Andromeda
Sb
Sombrero
Sa
Whirlpool
Sbc
Spindle galaxy
S0
Milky way
SB
Cigar galaxy
2
Large magellanic cloud
1
S0
Lenticular galaxies
lenticular galaxies
bright central bulge, no visible spiral structure, disc like structure
Fully evolved galaxies
Elliptical galaxies
3 types of black holes
Primordial
Stellar
Supermassive
Primordial black hole
size of an atom with the mass of mt everest
Collapsar (stellar) black hole
Mass of 5-20 times our sun, diameter of 10 miles
Supermassive black hole
few billion sun mass, big as our solar system
Event horizon
Schwarzchild Radius, point of no return
Acretion disk
x rays produced from collisions of matter
Ergosphere
where space is pulled around a rotating black hole
3 types of universe shape theories
Closed
Flat
Open
Dark matter
matter we cant see or interact with that influences everything
2 possible particles of dark matter
WIMPS and MACHOS
why do we think dark Matter exists
Gravitational lensing, discrepencies between gravitational and mass effects
Dark matter alternatives
MOND
TeVeS
2 types of dark energy
Constant energy and dynamic energy
Composition of the universe 70%______ 25%_________ 4%_______ 0.5%_________
Dark energy, Dark matter, Free hydrogen and helium, Stars
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