The speed of light in the vacuum is exactly 299,792,458 metres per second, normally rounded to 300,000,000 metres per second. It is a universal constant,Read More
Category: Universe
Stephen Hawking was one of the most important physicists of the last decade. One of the most important discoveries he made during his career wasRead More
Sagittarius A*, pronounced “Sagittarius A star”, and abbreviated Sgr A*, is a supermassive black hole that lies in the centre of our galaxy, the MilkyRead More
We know exactly which is the speed of light: c= 299,792,458 m/s, which always refers to the speed of light in the vacuum. And thisRead More
One of the terms that are mentioned the most when talking about black holes is the event horizon. This is one of the most importantRead More
The theory of the Big Bang states that the universe started in an extremely dense and hot state, and that it has been expanding andRead More
A few centuries ago, everyone believed that the Earth was the centre of the universe and that everything orbited around us. This vision of theRead More
Some hundreds of years ago it was thought that the Earth was the centre of the universe, that our planet was stationary, and that allRead More
The Earth, also known as the blue planet, is the third planet that orbits the Sun. The latter is one of the billions of starsRead More
The Earth belongs to the solar system. The star of this system is the Sun, and the latter is orbited by 8 planets (Mercury, Venus,Read More