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Download Our place in the Universe
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Our place in the Universe 1 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 it’s round). 2 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. 3 These stars are bigger The SUN These stars are NOT the biggest either •The Sun is average in size and temp 4 These are!!! The sun is so small in this picture that it takes as much space as ONE pixel of this image!!!! 5 The Known Universe 6 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! 7 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….. 8 Where did they all come from? •BANG!!! (the big one) 9 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!!! 10 E= mc2 • Energy = matter x speed of light squared • It means energy can be converted to matter and vice-versa. 11 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! 12 Is there any evidence of the BB? • YUP!!! There are TWO main pieces of evidence: 1. The universe is expanding… 2. In every single direction we look in space we see… Cosmic Background Radiation – That’s left over energy from the Big Bang bouncing around the universe. 13 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). 14 Gravity Waves • Acceleration of massive object can cause a ripple in space-time. *** Image BICEP 2 experiment. *** Still needs to be confirmed from other experiments!!! 15 16