Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.t1001c&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The twentieth century witnessed breathtaking discoveries about the nature of the cosmos. We learned that the universe is over ten billion years old, that it is expanding, and that ordinary objects (stars, planets, human beings) comprise less than five percent of what the universe is made of. The challenge for the twenty-first century will be to develop a true understanding of what these discoveries mean. What is the dark matter and dark energy that makes up most of the universe? How did the universe begin? How will it end?
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