Why is the sky dull when a storm is coming on?

Why is the sky dull when a storm is coming on

The light during the daytime on Earth is almost all brought by the Sun. The stars are always shining, of course, as they do all the time in the vast regions of space, but they are so far away that the light that all of them produce together counts for almost nothing … Read more

What is the Earth made of? What is beneath its crust?

What is the Earth made of? What is beneath its crust?

The Earth consists of multiple layers of metallic and rocky materials. Beneath the thick layers of lighter rock near the top or the surface is heavier rock. Under the heavy rock, there are rocks that contain metal, and the amount of metal that makes up these rocks is increasing the more you … Read more

How was it proven that the Earth is round and not flat?

How was it proven that the Earth is round and not flat

Even before a famous explorer circumnavigated the world or humans started going into space, the ancient Greeks had known that our planet is round and not flat. It was Pythagoras who raised the idea of the spherical world in 500 BC. But, it was around 2,000 years ago when Aristotle, the famous … Read more

What is the weight of the planet Earth? Is it constant or increasing?

What is the weight of the planet Earth? Is it constant or increasing?

Our planet is suspended in space, which means that its weight would differ in different gravitational fields. For example, in Earth’s gravitational field some object weighs, say, 1 kilogram, but the same object on the Moon (i.e. in the Moon’s gravitational field) would weigh 1/6 of its weight on the Earth. That … Read more