question 29\nwhat is one way in which scientists study dark matter?\na. they study how light bends around a…

question 29\nwhat is one way in which scientists study dark matter?\na. they study how light bends around a galaxy or galaxy cluster.\nb. they study shadows that are cast onto a galaxy or galaxy cluster.\nc. they study changes in the number of galaxies in a galaxy cluster.\nd. they study how the brightness within a galaxy or galaxy cluster changes.

question 29\nwhat is one way in which scientists study dark matter?\na. they study how light bends around a galaxy or galaxy cluster.\nb. they study shadows that are cast onto a galaxy or galaxy cluster.\nc. they study changes in the number of galaxies in a galaxy cluster.\nd. they study how the brightness within a galaxy or galaxy cluster changes.

Answer

Brief Explanations:

Dark matter does not emit, absorb, or reflect light, but its gravitational effects can be detected. Gravitational lensing occurs when light bends around a massive object like a galaxy or galaxy - cluster due to the gravitational influence of dark matter. This is a common way to study dark matter. Shadows cast onto a galaxy or galaxy - cluster are not a method for studying dark matter. Changes in the number of galaxies in a cluster and changes in brightness within a cluster are not related to the main ways of studying dark matter.

Answer:

A. They study how light bends around a galaxy or galaxy cluster.