EVERYDAY SCIENCE

Detailed explanation-1: -Light emitted from a star or galaxy can be separated into a band of colors, called a spectrum. Each color has a different wavelength just like sound has wavelengths. Notice the longer wavelengths are toward the red end of the spectrum.

Detailed explanation-2: -As the universe expands, the galaxies get farther from each other, and the apparent velocity will appear to be larger for the more distant galaxies. The Earth and the Milky Way are not special in seeing that all galaxies appear to be moving away from us.

Detailed explanation-3: -The cosmic microwave background (CMB) is a reverberation or afterglow left from when the universe was about 300, 000 years old. It was first discovered in 1964 as a ubiquitous faint noise in radio antennas.

Detailed explanation-4: -The Steady-State model states that the density of matter in the expanding universe remains unchanged over time because of the continuous creation of matter. In other words, the observable Universe essentially remains the same regardless of time or place.