To celebrate Space.com's 25th birthday, we're taking a look back at our favorite Lego space sets released since 1999. When you purchase through links on our site, we may earn an affiliate commission.

The Lego City Modular Space Station is sold out at several retailers, but Walmart's sale is still going strong.

When you're getting ready for a garage sale, it's tempting to put out all your old toys to clear space quickly. However, not every toy should be sold this way, as some hold more value or significance ...