Question

ne piece of evidence that supports the big bang theory?
a. the rotation and revolution of earth
b. the universe formed over 13 billion years ago
c. the universe is cooling down
d. a weak signal of cosmic microwave background radiation
which of the following is the main idea of paragraph 2?
a. the history of the hubble space telescope
b. background on the cosmic background explorer satellite
c. the explanation of the big bang theory
d. discussion of evidence that supports theories
what does it mean if a galaxy gives off light that has been shifted toward the red end of the electromagnetic spectrum?
a. the galaxy is much older than earth.
b. the galaxy is moving away from earth.
c. the galaxy is very hot and has not cooled down yet.
d. the remnants of an explosion are between the galaxy and earth.

Explanation:

First Question (Evidence for Big Bang Theory)

• Option A: Earth's rotation/revolution is about Earth's motion, not Big Bang evidence.
• Option B: The age of the universe (13 billion years) is a result of Big Bang theory, not direct evidence.
• Option C: The universe cooling down is a consequence, not a key evidence.
• Option D: Cosmic microwave background radiation is a well - known and crucial piece of evidence supporting the Big Bang theory, as it is the leftover radiation from the early universe predicted by the theory.

• Option A: If the paragraph was about Hubble Space Telescope history, the options would focus on its development, which is not indicated here.
• Option B: There's no indication the paragraph is about the Cosmic Background Explorer satellite's background.
• Option C: The paragraph is not just explaining the Big Bang theory; it's more about evidence (from the context of the first question about Big Bang evidence).
• Option D: Given the first question is about Big Bang evidence, the paragraph is likely discussing evidence that supports theories (like the Big Bang theory), so D is the most appropriate.

• Option A: Redshift is not related to the age of the galaxy relative to Earth.
• Option B: Redshift occurs when an object (like a galaxy) is moving away from the observer (Earth), as the light waves get stretched, shifting towards the red end of the spectrum.
• Option C: Redshift is not about the temperature of the galaxy.
• Option D: Redshift is not caused by explosion remnants between the galaxy and Earth.

Answer:

D. A weak signal of cosmic microwave background radiation

Second Question (Main Idea of Paragraph 2)