Visual demonstration of the performance of the diffraction grating. The zeroth order transmission refers to light that goes straight through the grating without undergoing diffraction (which should be ...

One of the biggest leaps in astronomy made by the Hubble Space Telescope was something dreamed up long after it launched: Taking extremely long exposure images of a part of the sky unobscured by ...

Today, astronomers seek to observe the faintest and most distant objects possible. Extremely Large Telescopes (ELTs), with apertures in the order of several dozen meters, are the next generation ...