With reference to the Dark Energy of the Universe, consider the following statements:
1. It is a force that opposes gravity and makes up about 69.4% of the universe.
2. It was discovered through key observations made by the Hubble telescope.
3. Scientists know about Dark Energy because it makes the universe expand faster.

How many of the statements given above are correct?
(a) Only one
(b) Only two
(c) All three
(d) None

Question

With reference to the Dark Energy of the Universe, consider the following statements:
1. It is a force that opposes gravity and makes up about 69.4% of the universe.
2. It was discovered through key observations made by the Hubble telescope.
3. Scientists know about Dark Energy because it makes the universe expand faster.

How many of the statements given above are correct?
(a) Only one
(b) Only two
(c) All three
(d) None

ONLiNE UPSC · Accepted Answer

Statement 1 is correct: Dark Energy is a repulsive force that is the dominant component (69.4%) of the universe. The remaining portion of the universe consists of ordinary matter and dark matter. Dark Energy is relatively uniform in time and space and is gravitationally repulsive within the volume it occupies.

Statement 2 is correct: Hubble telescope plays an important role in verifying, characterizing and constraining dark energy. The Hubble telescope made the key observations that led to the discovery of dark energy. Hubble continued to explore the nature of dark energy with observations such as the Great Observatories Origins Deep Survey (GOODS), structured to help uncover distant supernovas.

Statement 3 is correct: Dark Energy is detected by its effect on the rate at which the universe expands. It also affects the rate at which large-scale structures such as galaxies and clusters of galaxies form through gravitational instabilities.

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Dark Energy of the Universe

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M Question 1	⏱ 0
With reference to the Dark Energy of the Universe, consider the following statements: 1. It is a force that opposes gravity and makes up about 69.4% of the universe. 2. It was discovered through key observations made by the Hubble telescope. 3. Scientists know about Dark Energy because it makes the universe expand faster. How many of the statements given above are correct? (a) Only one (b) Only two (c) All three (d) None