They combined in groups to make protons, neutrons, and their antiparticles. Approximately how long did the era of nucleosynthesis last? 3 minutes.

Key Info. Your conclusions summarize how your results support or contradict your original hypothesis: Summarize your science fair project results in a few sentences and use this summary to support your conclusion. Include key facts from your background research to help explain your results as needed.

The era of nucleosynthesis lasted from about 1 minute after the Big Bang until 3 minutes after the Big Bang. This is when the temperatures were right for nucleosynthesis to produce elements.

How do we determine the amount of dark matter in elliptical galaxies? We measure the speeds of stars at different radii from the galactic center and determine how much mass is interior to the orbit. there are different Doppler shifts among the individual stars in the galaxy.

Why do we believe 90 percent of the mass of the Milky Way is in the form of dark matter? the orbital speeds of stars far from the galactic center are surprisingly high, suggesting that these stars are feeling gravitational effects from unseen matter in the halo. What does the universe look like on very large scales?

When theories are falsified by such observations, scientists can respond by revising the theory, or by rejecting the theory in favor of a rival or by maintaining the theory as is and changing an auxiliary hypothesis. In either case, however, this process must aim at the production of new, falsifiable predictions.

The Falsification Principle, proposed by Karl Popper, is a way of demarcating science from non-science. It suggests that for a theory to be considered scientific it must be able to be tested and conceivably proven false. For example, the hypothesis that “all swans are white,” can be falsified by observing a black swan.