Why is the spectrum of a star called an absorption spectrum?

Do any of the galaxies appear to be closer to each other as your universe expands? What does this say about the possibility of galaxies colliding with each other?

Blue light and yellow light combine to produce white light because a. they absorb each other s wavelengths. b. blue, yellow, and white are primary colors. c. they are complementary colors of light. d. they are both primary colors of light.

How much time is needed to produce 900 Joules of work if 120 watts of power is used?

Which of the following is an example of an applied science A. Biology B. Mathematics C. History D. Medicne

What is the address of the earth?

A star with the same mass of the sun has a newly discovered planet whose semi-major axis of 2.48 au and an eccentricity of 0.08. what is the aphelion distance of the new planet

What does a hurricane hunter do

Why is fluorine special in terms of electronegativity?

The airbag inflates and deflates quickly so

Two conducting spheres are each given a charge Q. The radius of the larger sphere is three times greater than that of the smaller sphere.