Far beyond Uranus is another blue planet, one named for the Greek sea god. It could well have been named for a god of winds as it's the windiest place in the Solar System. Find out more about Neptune, the planet that was discovered using math.

This ice giant is twenty times further from the Sun than we are. It orbits lying on its side so that half the planet can be dark for over twenty years at a time. This is the planet Uranus, discovered by William Herschel in 1871 and nearly named George!

Study the Sun, but treat it with respect! Protect your eyes and use equipment with care, and you can count sunspots and see solar eclipses and transits. Or from the the comfort of your living room your computer will let you see space telescope images of solar flares, prominences and maybe a comet.

Why does the Moon seem to change shape? If eclipses happen when the Sun, Moon and Earth are all lined up, why don't they happen every month? If you're an educator, you may need to understand why and explain it to children. Here are some online resources to help you out.

Since the name of Nicolaus Copernicus is still well known nearly five hundred years after his death, why was his grave unmarked until 2010? Find out about the life of the quiet revolutionary that turned our view of the universe inside out.

Four moons circling Jupiter? A sensation when Galileo discovered them in the early 17th century! They're still sensational. Find out which one is bigger than a planet, which seethes with volcanic activity and has mountains taller than Everest, and where there is an ocean that could harbor life.

Quasars are the brightest and most distant objects in the universe. And when we see them we are looking into the past, even before our Sun and Solar System existed.

It visits every 75 years or so, appearing like a celestial ghost in our skies. In the past it has been a bad omen and scary object, but last time it came it was a big event around the world. What is it? Halley's Comet, the most famous comet of all.

Flowers from the florist are popular for Mother's Day. But for really stellar mothers, here is a cosmic floral tribute with links to some dazzling astronomical images.

Ordinarily, the answer is no. But although sound cannot travel in a vacuum, there are conditions in space that allow sound to carry.