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This Lens Is Bigger Than Any Camera Lens Ever

By Jesus Diaz on at

The Canon 5200mm super telephoto lens may be the world's largest camera lens, but it's no match for lenses the size of an entire galaxy, so massive that they deform the light of objects behind them. They're called gravitational lenses.

Earth Has a Second Moon, Says Astronomers

By Jesus Diaz on at

In a research paper called "The population of natural Earth satellites", astronomers say that Earth must have a second moon at any given time. They have calculated the population of "irregular natural satellites that are temporarily captured" by Earth.