Slide1 :
Slide2 : If a beaker contains 100 mL of water, we expect the water to have a mass of 100 grams, since the density of water is 1 g/1 mL. Let’s say the balance showed the contents of the beaker to have a mass of 1000.00 grams. Ah, there must be more to this situation than “meets the eye.”
Slide3 : In our solar system, the inner planets revolve more rapidly in orbit than do those farther out. Why do you think this is so?
Slide4 : Most astronomers thought that rotating galaxies should show the same characteristics as our solar system.
Slide5 : Scientists were surprised to find that there are stars in our galaxy at a greater distance from the center of the galaxy than our sun that revolve faster than our sun!
Slide6 : Could one answer to our beaker “discrepant event” be that 90% of its contents are dark matter?
Slide7 : Dark matter may be clumped around galaxies, in much the same way that we found matter clumped around voids in “The Spongy Universe.”
Slide8 : A spectroscope can be used to detect composite radiation spectra of individual stars and gas in a particular location of a spiral galaxy.
Slide9 : Gravitational lensing is a technique for measuring distance that takes advantage of the fact that matter distorts the space surrounding it.
Slide10 : Across the visible part of a galaxy, the luminous disk is matched by an equal nonluminous halo mass of dark matter.
Slide11 : Clusters of galaxies are at least nine-tenths dark matter.
Slide12 : MACHOs stands for Massive Compact Halo Objects. MACHOs are made of baryons.
WIMPs are leptons, an abbreviation for Weakly Interacting Massive Particles.
Slide13 : Where does that leave us? ?