Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
Most telescopes are on the ground.
On the ground, you can deploy a heavier telescope and upgrade it more easily. The trouble is that Earth-bound telescopes must look through the Earth's atmosphere . First, the Earth's atmosphere blocks out a broad range of the electromagnetic spectrum , allowing a narrow band of visible light to reach the surface. Second, the Earth's atmosphere blurs the light it lets through. The blurring is caused by varying density and continual motion of air.