Zooniverse you can help real scientists learn about the universe. Telescopes are pulling in huge amounts of data and the human brain is better than computers for classifying galaxies and spotting supernovas.
photo source: NASA and ESA
The first Zooniverse project, Galaxy Zoo has provided “many unique scientific results, ranging from individual, serendipitous discoveries to those using classifications that depend on the input of everyone who's visited the site.”
This is a fabulous homeschooling project because it provides kids an opportunity to participate in real scientific research.
And if that is not enough incentive, “To encourage you to keep clicking, [Galaxy Zoo is] still giving away individual prizes to one person at random for each collection of 250,000 classifications.”