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…