For thousands of years men believed that the Moon was so remote that it was inaccessible. When someone was told that she was in the moon, they meant that she …
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is the visible spectrum that is visible to the human …
Compared to the 40m diameter ELT, which will likely be used for 100 years and more, the JWST will fail 10 years after launch due to lack of fuel. If …
Before we consider exploring our galaxy and the universe, we must first and foremost place our home, the earth and the solar system in this vast cosmos. The knowledge we …
Our Galaxy forms a disc a little thicker in the center that is observed in profile, which is why the Milky Way seems very long and quite thin. The stars …
In its daily run through the sky, the Sun offers a great way to know the time. Since it always moves at the same speed it can be used as …
The Earth rotates on itself about an axis which is inclined by about 23 ° 27 ‘with respect to the vertical. Why 23 ° 27 ‘? Because one day a …