Question

question 20
we cannot see the same set of constellations all year because

• the earths axis precesses.
• aliens move the constellations to trick people on earth.
• some constellations are circumpolar.
• our view depends on where the earth is located in its orbit around the sun.

Explanation:

As the Earth orbits the Sun, our vantage - point in space changes. Different constellations become visible at different times of the year depending on Earth's position in its orbit. The Earth's axis precession is a very slow change over thousands of years and not the main reason for not seeing the same constellations all year. The idea of aliens moving constellations is not a scientific explanation. Circumpolar constellations are always visible from a particular location, but this doesn't explain why we don't see all constellations all year.

Answer:

D. our view depends on where the Earth is located in its orbit around the Sun.