The information that scientists can gather about the early universe is in the form of light from distant galaxies. This light requires millions of light years to reach earth. If we can see the most distant galaxies, we can observe conditions in the early universe. Scientists analyze galaxy spectra to infer how the universe began. The current prevailing theory of the origin of the universe is called the big bang theory, which states that the universe began in a massive explosion of an extremely dense, hot ball of matter approximately 13.7 billion years ago.
1. Open the Shifting Light Spectra activity. When prompted, use the slider to move the galaxy as directed. Describe how the galaxy's spectrum changes as
it moves away from and toward the blue planet.
2. When prompted, explore further. Select each galaxy to see its spectrum. Select blue or red to indicate if the galaxy's spectral lines show redshift or blueshift. Then choose whether the change in spectral lines would indicate a
diverging and expanding universe or a converging and shrinking universe.

The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

Aroller coaster car is traveling down a track at 22 m/s. the car has a mass of 2000 kg. what is the kinetic energy of the car? a) 22,000 j b) 968,000 j c) 484,000 j d) 44,000 j

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth