Physical chemists are justifiably proud of their tiny motors that do little more than spin. How can they say that much more complex motors in life evolved?
Jupiter’s moon Europa, somewhat smaller than Earth’s moon, may have surface water and organic chemicals, researchers say.
For photosynthesis to proceed on a planet like Earth, sunlight (visual light) must penetrate the atmosphere all the way to the ground.
If redwoods are a byword for great stature, grasshoppers represent the opposite. And what insect could be more common or familiar?
Prochlorococcus, which lives in the ocean, may be the most abundant species of life on earth. It produces about 20 percent of the oxygen we breathe.