The brightest star in the universe, a supernova, is thought to be about a million times brighter than our own sun. if polaris, located about 434 light years from earth, were to go supernova today, why would no one currently on earth ever know it happened?
a) it would take the light 434 years to reach the earth.
b) the light would be so dim that our eyes would not detect it.
c) the light would be so bright that or eyes could not detect it.
d) the light from the supernova would never reach the earth as it would travel in a different direction.

If Polaris were to go supernova today, no one currently on Earth ever know it happened because it would take 434 light years to reach the Earth

Explanation:

The Polaris or the North Star that we can see at the North Pole of the Earth in the night historically dates back to 434 years in the past. If the Polaris becomes a supernova or if it dies now, it will take 434 years in the future from now to know about it.

This is simply because ‘one light year is the distance traveled by light in one year’. Hence currently, one cannot know about what happened to the Polaris supernova even if it happens now.

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

the answers are a and c