Question

10
multiple choice 2 points
the mass of a star most determines how its lifetime will develop.
true
false
11
multiple choice 2 points
units of time are based on earths motion relative to other celestial objects. the year is best defined as earths motion relative to the
asteroids
sun
moon
planets

Explanation:

• For question 10: A star's mass is a crucial factor in its life - cycle. More massive stars burn through their fuel (nuclear fusion) at a faster rate. For example, a high - mass star may have a much shorter lifetime (in the order of millions of years) compared to a low - mass star (which can live for billions or even trillions of years).
• For question 11: The year is defined as the time it takes for the Earth to complete one full orbit around the Sun. This orbital motion is the basis for the calendar year. The Moon's motion relative to the Earth gives us the month (lunar month), and the motion relative to asteroids or other planets is not the basis for the year.

Answer:

1. True
2. Sun