PHYS 180 Lecture Notes - Lecture 16: Gravitational Lens, Spiral Galaxy, Big Bang
Document Summary
The more mass there is in spiral galaxy the faster they should spin, faster orbits. We can weigh a galaxy by measuring how fast its spinning. There is 10x more mass than we can actually see in every wavelength. We re missing 100x mass in galaxy clusters. Looking at bending of space time because of matter. Causes light ot take different paths of light through space to us thus distorting images. You can see the lenses by the arcs. We can determine how much space has been warped. This has led us to believe that there is dark matter out there. Dark matter is real we can see its gravitational effects but we don"t know what it is. Dark matter doesn"t exist and the problem is that we don"t understand gravity. All experimens support general realtivity and dark matter. All we need is one experiment to falsify the theory.
