The difference between apparent solar time (the actual time between noons) and mean solar time (the average time between noons) is called the equation of time.
The heliosphere is a bubble of solar gas that extends outward and protects the planets from interstellar radiation. Scientists would like a probe to study it.
Elephants are highly intelligent and social animals. And now, a new study shows that elephants use names when communicating with each other, just like humans.
Atmospheric carbon dioxide is accumulating faster than ever, accelerating to levels far above any experienced during human existence, say climate scientists.