According to the ________________, all of the matter and energy in the Universe was once condensed into a single, incredibly dense point, which then exploded and began to expand in all directions.

When a galaxy is moving away from Earth, the wavelength of light it is giving off is…

What can we conclude from the observation that nearly all galaxies are moving away from us?

According to the Big Bang theory of the origin of the universe, the universe has expanded from a hot dense state into a vast, cooler state. What would be considered scientific evidence supporting this theory?

Consider the nuclear reaction that takes place in the sun. Two nuclides of hydrogen fuse to form helium. Is helium the only product of this reaction? If no, identify any additional products.