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Rings of Neptune. Voyager 2 imaged Neptune's dark, faint rings in 1989. Before that, earthbound scientists had only been able to find evidence of parts of rings. [Image credit: NASA] Mona Evans, "Neptune Facts for Kids"

Olympus Mons on Mars is the biggest volcano in the Solar System. It's nearly three times the height of Mount Everest at nearly 22 km (14 miles) and as big as Arizona. (Photo: JPL NASA) ©Mona Evans, "10 Amazing Facts about the Solar System"

Neptune's first birthday since its discovery was on July 12, 2011. Johann Galle found Neptune on September 24, 1846, but a Neptunian year is quite long! ©Mona Evans, "10 Amazing Facts about the Solar System"

Rheasilvia Crater on Vesta. You might have trouble picking out the crater in the picture. It's 505 km (314 miles) across and covers most of the southern hemisphere, so the picture is almost all crater. (Photo: NASA's Dawn spacecraft) ©Mona Evans, "10 Amazing Facts about the Solar System"

This color photo of Neptune's largest moon Triton was obtained by NASA's Voyager 2 probe on Aug. 24, 1989, from 330,000 miles away. The resolution is about 6.2 miles, sufficient to begin to show topographic detail. Credit: NASA/JPL

Saturn on June 13, 2012. A beautiful, dramatic image – unprocessed – from the Cassini probe 1.6 million miles from the planet. Wow! Even at that distance the rings don't completely fit into the picture. (Image credit: NASA/JPL/Space Science Institute) ©Mona Evans, "10 Amazing Facts about the Solar System"

Saturn's northern hexagon (color-composite image). Cassini imaged the stream of winds of the upper atmosphere that form a hexagon at this latitude. It's about 25,000 miles across - that's enough space for four Earths. (Image credit: NASA/JPL/SSI/Jason Major) ©Mona Evans, "Saturn Facts for Kids"

Infographic: unmanned Voyager 1 and 2 probes visited the outer planets of the solar system and are approaching the edge of our solar system. After 35 years of space travel, the twin Voyager planetary probes are nearing the edge of Earth's solar system--they will become the first man-made objects to travel between the stars. Text and image credit: Karl Tate /

Lunar occultation of Jupiter, Christmas Day 2012. (Image: Avaní Soares) A sequence of images showing the Moon hiding Jupiter from view. ©Mona Evans, "10 Amazing Facts about the Solar System"

Uranus has rings. William Herschel, the planet's discoverer, noted a ring in 1787. As others didn't, people thought it was a mistake. Yet Herschel was a first class observer and telescope maker, and he may have been lucky with the observing conditions, so the jury is still out. But there's no mistake about the rings in this infrared image. (Photo: E. Karkoschka et al.) ©Mona Evans, "10 Amazing Facts about the Solar System"

Saturn has rings. And how! in my absolute favorite Cassini probe picture. We are looking inwards towards an eclipsed Sun from the night side of Saturn. Yet light reflected from the ring system is lighting up the dark side of the planet. Click the image to enlarge & look beyond the bright central rings, just inside the next ring out on the left hand side, and find the small dot. That's Earth. ©Mona Evans, "10 Amazing Facts about the Solar System"…

The Sun is shrinking - it's losing five and a half million metric tons of mass every second. That sounds like a lot, but don't worry! Our star contains nearly 99.9% of the mass of the whole Solar System, the leftovers being for everything else: planets, dwarf planets, moons, asteroids, comets, Kuiper Belt objects and interplanetary gas and dust. ©Mona Evans, "10 Amazing Facts about the Solar System"

Saturn. I love how you can see thru the rings, and I love the different-- vertical-- orientation. Finally, I love how the Cassini probe continues to beam us such amazing photographs of the Saturn system!!!

Uranus. Its blue-green color comes from methane crystals in the atmosphere. The rings do circle the equator, but Uranus is tipped so much on its axis that it orbits on its side. (Image credit: Voyager, NASA) Mona Evans, "Uranus Facts for Kids"