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The Milky Way

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on 16 April 2015

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Transcript of The Milky Way

Our Galaxy: What is the Milky way?
1 of hundreds of billions of galaxies in the universe
3 major types: Spiral, Elliptical, Irregular
flattened disk like formation wth spiral arms
named because of the band of glowing light that resembles spilled milk
The Milky Way
1610 Galileo Galilei proved with telescope that individual stars were part of a band
we can only see it from the inside, containing the disk, halo, and bulge, & outside globular clusters
measured to be around 120,000 light-years across & 1,000 light years thick
Sun is located in the Orion Arm, between 2 other arms of Milky Way
Spiral Arms:
after careful surveys, only 2 spiral arms discovered: Scutum- Centaurus & Carina-Sagittarius (thought to be 4 total)
formed from density waves that orbit Milky Way
Started from gas clouds that began to contract from gravity, causing remaining gas to form a disk
formed because of collisons of smaller galaxies
these mergers collected dust and stars along the way
Milky expected to collide with Andromeda in 3-4 bil. years to form giant elliptical galaxy
The Milky Way
by Taylor Johnson

Interesting Fact!
Did you know:
Dung Beetles navigate at night using the Milky way
disk: stars orbit in same up & down motion in galactic center, with active star formation
halo: stars have random orbit that surround disk, no active star formation
bulge: central concentration of stars also with random orbit
Galactic core: a black hole, 4 mil. times more massive than our Sun, yet same size as solar system
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