A redshift can be described as:
A number used to measure a galaxy’s size
A new galaxy that is forming
A galaxy that is moving toward us
A galaxy that is moving away from us
Please help, and this is fro astronomy

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

a) the particles of the chair are strongly held together.

you need to have a picture of the atom that way we can answer it