The Cosmic Microwave Background (CMB) is a strong, hot, active signal that astro

Question

The Cosmic Microwave Background (CMB) is a strong, hot, active signal that astronomers have detected in the Milky Way galaxy, but nowhere else. True or False The value of the Universe's critical density determines, in part, whether the universe will continue to expand, or eventually collapse. True or False Which of the following are true about the Cosmological Constant? It represents a force causing the Universe to expand/accelerate. Einstein had originally envisioned it solely as something to oppose gravity's attractive force, in order to keep the universe at a constant size. The universe is expanding and accelerating, so there must be something real represented by the cosmological constant. Many scientists believe that this is dark energy. All of the above are true.

Explanation / Answer

PART A-TRUE
CMB is a radiation that fills the universe andcan be seen in every direction.

PART B- Unclear as to what Universe's critical density means. If it means Universe's density then answer is TRUE. If it means the critical density then the answer is FALSE.
The ‘critical density’ is the average density of matter required for the Universe to just halt its expansion, but only after an infinite time. A Universe with the critical density is said to be flat.
In his theory of general relativity, Einstein demonstrated that the gravitational effect of matter is to curve the surrounding space. In a Universe full of matter, both its overall geometry and its fate are controlled by the density of the matter within it.

PART-C-D All of the above are true.

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