How the Universe Works - Galaxies
billion years old.
1. Our galaxy the Milky Way is around ___
a.
Galaxies are huge collections of ___
,star nurseries called
in fact.
b.
In 1924, Edwin Hubble realized the fuzzy blobs of light he saw far away weren't stars, they were___
c. In space, light-years (_____
) are often used to measure the vast distances.
d.
Earth is 25,000 ly from the center of the Milky Way, which is
compared to some in our Universe...
Our nearest galactic neighbor Andromeda is over.
At 6 million ly across,
e.
f.
is the biggest galaxy ever found.
ly across.
2. In the high desert of northern Chile, the Atacama Cosmology Telescope (ACT) sits.
sea-level, making it the
ground-based telescope in the world.
a. This doesn't detect visible light, it "sees" cosmic_
just a few 100,000 years old. It can also see how they.
b. Our understanding now is that stars form_
clusters of galaxies that build into
across- and small,
from when the universe was
feet above
that build into galaxies that build into
of galaxies (biggest structures we see).
I
3. Young galaxies are messy and chaotic-what pulls the smaller structures together is_
a. While galaxies are all different, they seem to have one thing in common: at the center.
b. A.
is an supermassive black hole that is emanating pure energy into space.
The black hole at the center of our galaxy is massive - million miles across.
c.
d. Dark matter is what is thought to be holding our galaxy,
e. Gravitational lensing allows us to test the.
of dark matter.
hersive Rea
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