Why did people believe earth is the center of the solar system when it’s obvious the sun is?

To start with: the sun is not the center point of solar system. But the answer is more complicated than that. First, we have to define the center of our solar system, then we need to investigate why people believed the earth was the center instead of the ‘obvious’ answer of the sun, which is … Read more Why did people believe earth is the center of the solar system when it’s obvious the sun is?

How long before the expansion of the universe causes our earth to drift away from the sun?

Although it is true that the universe is expanding at a rapid rate, this expansion of the universe does not affect our galaxy in the ways you might think.How galaxies are affected by universe expansionOur galaxy is made up of astronomical bodies, all of which orbit other objects and have a set path that has … Read more How long before the expansion of the universe causes our earth to drift away from the sun?

Light has no mass so it also has no energy according to Einstein, but how can sunlight warm the Earth without energy?

Although it is true that light has no mass, it does in fact carry energy. This answer is a little more complex than that simple statement though and may require you to have a little basic knowledge on Einstein’s theory of special relativity: the theory that can explain how space and time are linked. E … Read more Light has no mass so it also has no energy according to Einstein, but how can sunlight warm the Earth without energy?