About 4.6 billion years ago, our solar system formed from a massive cloud of gas and dust. Under the influence of gravity, this material began...
The universal law of gravitation, stated by Isaac Newton, explains why objects in the Universe are attracted to each other. Essentially, the more massive the...
The Moon orbits around the Earth, and our planet in turn orbits around the Sun. The journey of the Earth around the Sun lasts about...
Stars, like our Sun, are gigantic balls of gas composed mainly of hydrogen. At their core, the pressure and temperature are so enormous that reactions...
The Moon often appears much larger when it touches the horizon than when it is high in the sky. However, its actual size does not...
Comets resemble sort of dirty snowballs, primarily made of water ice, dust, frozen gases like carbon dioxide and ammonia, as well as small rocky pieces. These icy...
When the light from the stars reaches Earth, it must pass through our atmosphere, made up of several layers of air with varying temperatures and...
Our planet rotates around an imaginary axis connecting the two poles, somewhat like a top. This movement, called Earth's rotation, takes about 24 hours to...
Earth's gravity acts on the Moon much like an invisible string that keeps an object revolving around itself when you spin it with your arm. This attractive...
At the time of Galileo, the Catholic Church adopted a literal interpretation of certain biblical passages. For it, texts like the one where Joshua stops...
