What is a lunar eclipse? What is a solar eclipse? These babies are like full moons or new moons on steroids—so, here’s what you need to know. Consider eclipses as super-charged new moons and full ...

Most of us grew up learning that there are nine planets in our solar system. Back in 2006 that all changed, when Pluto was demoted from being labeled a proper planet to its new classification as a ...

Definition: Solar power is energy harnessed from the sun’s rays. It is a renewable energy source, meaning it is a cleaner, more sustainable alternative to burning fossil fuels. Solar power produces no ...

Why it matters: Most of us have seen the Sun thousands upon thousands of times throughout our lives, but only from a distance. True, high-definition images of our life-giving star are in short supply, ...

The original definition of planet is wanderer, from the Greeks who watched these bright lights wander through the firmament of fixed stars. Observers discerned nine of these travelers over the course ...