Our place in the Universe

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Our place in the Universe
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This is what we think our galaxy, the Milky Way,
looks like.
The Sun is about ½ way from the center on a
galactic arm
The Sun takes 225 million years to orbit the
center
The sun is NOT this big NOR is it a star shape
(shhh its round).
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The Sun is NOT the biggest star!

• 109 Earths fit across the diameter of the SUN.
• You can fit 1.3 million Earths INSIDE the Sun
• The Sun, the planets and anything that orbits the
  Sun is called the Solar System.

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These stars are bigger
These stars are NOT the biggest either
The SUN

• The Sun is average in size and temp

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These are!!!
The sun is so small in this picture that it takes
as much space as ONE pixel of this image!!!!
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The Known Universe
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Is the Milky Way the only galaxy out there???

• NO WAY!!!
• We are one of billions!
• We estimate there are over 100 billion GALAXIES
  beyond our own!

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Hubble Ultra Deep Field (HUDF)
Hubble took 11 days to look at a spot in the sky
that appeared to be empty. This is what it found.
THAT
AND THIS

• Every point of light you see is another galaxy
  filled with 100s of billions of stars.
• Except for..

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Where did they all come from?

• BANG!!! (the big one)

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What is the BB?

• Approximately 13.82 billion years ago (bya) or,
  13,820,000,000 yrs. there was an explosion OF
  space and time (not IN space and time like normal
  sized bangs).
• So, in short, the Big B was the formation of our
  Universe (all energy, matter, and space-time)

BANG!!!
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E mc2

• Energy matter x speed of light squared
• It means energy can be converted to matter and
  vice-versa.

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Does it matter?

• Initially after the Big Bang there was only
  Energy.
• As the universe expanded, it cooled. This allowed
  the first subatomic particles to form (protons,
  neutron, electrons).
• The simplest elements were the first to form.
  Hydrogen and helium. The fuel for STARS!

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Is there any evidence of the BB?

• YUP!!!
• In every single direction we look in space we
  see
• Cosmic Background Radiation
• Thats left over energy from the Big Bang
  bouncing around the universe.

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Here is a map of it
You have to imagine that this is our entire
3-dimensional view of the sky flattened into a
map. EVERY 3-dimensional direction we look we
see CBR (cosmic background radiation).
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