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Components of the Universe Note Section. The Solar System- One star and everything that orbits it.
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Transcript of Components of the Universe Note Section. The Solar System- One star and everything that orbits it.
How big is a galaxy?
# of stars: about a billion or so (smallest)- up to 100’s of billions for
large galaxies
Diameter: Very large: what units of distance should be used?
-- using miles gives awkwardly numbers.
-- a larger unit is needed.
-- for example…..
Light-Travel-Time from the Earth
TO TIME DISTANCE
a. the moon 1.25 sec 1.25 light-seconds
b. the sun 8.5 minutes 8.5 light-minutes
c. Pluto ~6 hours
d. Alpha Cen 4.3 yrs 4.3 LY
e. North Star 650 years 650 LY
f. M31 2.5 million yrs 2.5 M. LY
..so just keep in mind that all of those units of length
are based on the speed of light;
- for example: 1 light-minute = the distance that light travels in one minute
Galaxies contain more than just stars. The irregular-looking blobs are either hot (pink) or cold (dark) interstellar clouds
Galaxies occur in galaxy clusters.This is M31 (the Andromeda Galaxy)…
…. and friends (2 smaller neighboring galaxies)- sort of a “triple galaxy”