Jupiter

If you go outside after dark, face south, and look up 45 degrees, you will see a very bright star. Except that it's not really a star; it is Jupiter.
About a year and a half ago, Jupiter and Earth were the closest they have been in twelve years. Of course, my astronomy loving children rejoiced. We went out to look at it that first night. It was magical.

Then we bought a telescope so we could see it better.
What we saw was unbelievable:
Jupiter and three of its largest moons.

It has a total of sixty moons, four of which are large and were first seen by Galileo. Mind you, I forgot most of these facts and had to ask Zusha :).

Although we aren't in the closest spot to Jupiter anymore, it is still very visible from about October - April. It's the brightest object in the sky right now. Just look up at where the sun would be at about midday.