The Birth and Death of the Milky Way

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by Reina Reyes, Ph.D.
Talk given at The Mind Museum, Taguig, Philippines on Feb 11, 2012

In this talk, I show the latest astronomical observations and cosmological simulations to tell the story of how galaxies formed over the last ten billion years, and how our own Milky Way galaxy will meet its end a "mere" three billion years from now.

(Slides have been edited for the web.)

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  • Dear Reina,

    Ipinagmamalaki ko na isang kang Matalinong Filipina. Alam mo ba saan galing ang lahi nating mga Filipino? Alam mo ba ang sabi sa Biblia, Turuan mo ang mga Matatalino. Pakibasa sa www.scribd.com ang mga articles; Kasaysayan ng Lupang Hinirang, Philippines is Ophir Expained, Tagalog at Bisaya, ABBA YAHWEH, Saan Galing ang Biblia, Secular Globalization will overtake the Religious Belief, Apo ni Abraham , Levites is the Lost Tribe of Israel, Marinduque and the lost tribe of Israel, and many more



    Bigyan kapa ng higit pang talino ni YAHWEH



    Datu-Aca Tabilog
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  • Image credit: Serge Brunier\n
  • Image: painting by Paul Gauguin “What are we? Where did we come from? Where are we going?”\n
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  • Image: Cosmic microwave background map from NASA’s WMAP.\n
  • Image: Ultra Deep Field image from NASA’s Hubble Space Telescope\n
  • Image: Galaxy map from Sloan Digital Sky Survey (M. Blanton)\n
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  • The Birth and Death of the Milky Way

    1. 1. TheBirthandDeathof theMilky WayReina Reyes, Ph.D.
    2. 2. * What are we? (Where are we?)* Where did we come from? These are questions* Where are we going? people have been asking since time immemorial...
    3. 3. * What are we? (Where are we?)* Where did we come from? Now, we can begin to answer them. Let’s start with a* Where are we going? journey through space...
    4. 4. * Where are we? We are on a planet (Earth), one of 8 going around a star (the Sun), one of a 100 billion in a galaxy (the Milky Way), one of a 100 billion in our Universe We live in a vast Universe, which itself may be just one in an even vaster multiverse!
    5. 5. * What are we? (Where are we?)* Where did we come from? On to the next question:* Where are we going? Where did galaxies come from?
    6. 6. This is a map of the Universe soon after its birth, a “babyphoto”. The red and blue spots show 1 in 100,000 differences.The early Universe was extremely smooth-- no galaxies, noplanets, no people.
    7. 7. This is the Universe today. There are galaxies everywhere.
    8. 8. This is a map of the Universe today, a “current photo”.Each green and red dot is a galaxy. Galaxies are clumpedtogether-- forming the cosmic web.
    9. 9. smooth clumpy The question is then: How did the Universe go from smooth to clumpy in 13.7 billion years?
    10. 10. How to build a galaxy? Let’s build one in 3 steps!
    11. 11. How to build a galaxy?• Step 1: Build a Universe
    12. 12. * What are the “ingredients” of the Universe? Atoms-- all of chemistry and biology-- make up only 4%. The dominant stuff is unseen, dark matter. (And then there’s the 73% we neither see nor quite understand, dark energy.)
    13. 13. Every galaxy is l
    14. 14. How to build a galaxy?• Step 1: Build a Universe• Step 2: Turn on GRAVITY We can do this in a computer simulation. Roll tape...
    15. 15. smooth clumpy As gravity pulls matter together, the Universe gets clumpier. After 13.7 billion years, we get a cosmic web like what we see today.
    16. 16. How to build a galaxy?• Step 1: Build a Universe• Step 2: Turn on GRAVITY• Step 3: Add ordinary matter (the hard part) This, we can start to “guess” in a computer simulation. Roll tape...
    17. 17. * What are we? (Where are we?)* Where did we come from?* Where are we going? Where is the galaxy going?
    18. 18. This is our galaxy’s neighbor,another big (and beautiful) spiral galaxy-- 3 million light-years away.
    19. 19. Get the hint? Roll tape...
    20. 20. * What are we? (Where are we?)* Where did we come from?* Where are we going? We have some of the answers, but we will never stop asking...
    21. 21. Thanks for watching! You can find me on:• Facebook: www.facebook.com/reinabelle• Twitter: www.twitter.com/reina_reyes

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