A massive body can bend the path of a beam of light as it travels through space; it causes light to travel on a path rather than along a straight line.

Light waves compress as an object is moving toward an observer, causing the light to shift to the end of the electromagnetic spectrum.

Black holes can't be observed directly because they don't produce , so the location is identified by examining the motion of nearby stars.

Even less understood than dark energy is dark , making up 27 percent of matter in the universe and cannot be observed with light.

Holding the Milky Way together is accomplished by the provided by a supermassive black hole near the center of the galactic bulge.

Respond to the following based on your reading.

Explain why the galactic disk appears blue and the galactic bulge appears red.

oof physics is gay so I'll just take the points and dip XD

don't report my answers re.tard XD

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.