As noted in the introduction, some scientists have proposed that dark matter does not really exist. according to this view, all matter is ordinary (baryonic), but at large distances from matter, gravity does not precisely obey either newton's or einstein's theories of gravity. is this alternative view of gravity consistent with what we observe in the bullet cluster? why or why not?

Awalk up the phase change graph worksheet

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.