Question

Why does the Moon always show us the same face? ...
what is a light-year? ...
What is the speed of light? ...
Where does the Solar System end? ...
How to study astronomy? ...
What is the closest galaxy? ...
What is the age of the Universe? ...
What is the size of the Universe?

Answer 1

Answer:The moon keeps the same face pointing towards the Earth because its rate of spin is tidally locked so that it is synchronized with its rate of revolution (the time needed to complete one orbit). In other words, the moon rotates exactly once every time it circles the Earth.

Light year is unit of distance. It is used to meansure very long distance like the distance between sun and earth.

1 light year =

$1 \times {10}^{ - 15} m$

Solar system ends after the atmosphere of Neptune, the last planet.

Astronomy could be studied as a branch of physics.

Closest galaxy is Canis Major Dwarf Galaxy

Universe is 4.5 Billion years old.

Size of universe is infinite.

Answer 2

Answer:

Moon always shows the same face because the moon rotates exactly once every time it circles the earth.

Speed of light = 3x10^-8 m/s

Explanation: