Tour of the Planets

There are eight planets circling our Sun. Just eight. Every one of them is a totally different world — some rocky, some gas, some hot enough to melt lead, some so cold your breath would freeze in mid-air. Let's fly past all of them.

The eight planets fall into two teams. The four closest to the Sun are rocky — small, dense, you could stand on them. The four farther out are gas giants — massive balls of swirling gas with no real surface. Jupiter, the biggest of the gas giants, is so wide that eleven Earths could line up across its face.

Eight planet names in order — that's a lot to keep straight. So here's the trick astronomers teach. Take the first letter of every planet — M, V, E, M, J, S, U, N — and stick them into a silly sentence. My… Very… Excellent… Mother… Just… Served… Us… Noodles. My Mercury. Very Venus. Excellent Earth. Mother Mars. Just Jupiter. Served Saturn. Us Uranus. Noodles Neptune. Say it twice. You'll have it for life.

Let's meet the rocky four. First — Mercury. Covered in craters. Scorching by day, freezing by night.

Venus — wrapped in thick acid clouds. Hotter than Mercury, even though it sits farther from the sun.

Earth — the lucky one. Liquid water, breathable air, life.

Mars — rusty red, cold and dry now, but it once had rivers and maybe oceans.

Now the gas giants. First — Jupiter. The biggest planet of all. Its Great Red Spot is a storm wider than Earth, and it's been raging for over three hundred and fifty years.

Saturn — those iconic rings are billions of chunks of ice and rock.

Uranus — tipped almost ninety degrees on its side. So instead of spinning like a top, it rolls along like a bowling ball. Each pole gets forty-two Earth years of nonstop sun, then forty-two of total dark.

Neptune — winds over one thousand two hundred miles an hour, the fastest in the solar system.

Your turn. Click any planet up there. You'll see a real NASA photo plus the basics — how big it is compared to Earth, how long a day and year are, the temperature, and what you'd weigh if you stood there. Hit compare mode to put two planets head-to-head.

Wait — what about Pluto? Yeah. Pluto used to be the ninth planet, until two thousand six. Astronomers wrote three rules to be a real planet. One — orbit the sun. Two — be round from your own gravity. Three — clear out your orbital neighborhood, meaning no big rocks left in your lane. Pluto fails rule three. There's tons of other stuff in its lane. So now it's a dwarf planet, hanging out with friends like Eris and Makemake.

So there you have it. Eight planets, one sun, and not a single one is boring. Some are rocky, some are gas, some have storms still raging after hundreds of years. Next time you look up at a wandering bright dot in the sky — that's a planet. That's one of these worlds. And it's part of your neighborhood.