Components of Universe
Transcript Components of Universe
Components of the Universe
The Solar System- One star
and everything that orbits it.
Planets: the larger bodies orbiting the Sun (or any other star)
The planets of our Solar System [& Pluto]
The biggest planet is….
-- but the biggest object in the Solar System, by far, is …..
Surface of Sun – Gas bubbles
Solar Flare – an explosive event on the Sun’s surface
Galaxy- Billions of stars bunched together.
The Sun is a star in the Milky Way Galaxy.
A spiral Galaxy seen Edge-on
-the actual 3D-shaped is like a pancake with a lump in the center
How big is a galaxy?
# of stars:
about a billion or so (smallest)
- up to 100’s of billions for
Diameter: Very large: what units of distance should
-- using miles gives awkwardly
-- a larger unit is needed.
-- for example…..
Light-Travel-Time from the Earth
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
galaxy is a
The Sun is in
a spiral arm
Map of Milky Way
Our Sun(yellow dot) is in a spiral arm, ½-way out
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”
The Universe is Everything- All the Galaxies
Distance = 500 million LY
What can you see with the naked eye? [outside of the Solar System]
- Milky Way stars! (meaning only stars in our own galaxy)
i.e., you cannot see any individual stars in any other
galaxy;-- they’re just too far and too faint
Note: Every star visible to your eye is part of the Milky Way!