🤖 Moon’s Phases

This graphic shows the position of the Moon and the Sun during each of the Moon’s phases and the Moon as it appears from Earth during each phase. Not to scale. Credit: NASA/JPL-Caltech

🗳️ Einstein's Cosmological Constant

Question

What is Einstein's cosmological constant?

Answer

A) the value of the expansion rate of the universe

B) the value of the acceleration of the universe

C) the value that measures the strength of gravity across the universe

D) the size of the cosmological horizon

✓ E) a repulsive force that counteracts gravity and was introduced to allow for a static universe

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