Its actually quite safe. My hubby, the computer freak was fine with me installing it. Its kind of cool, you basically leave your computer on (you can turn the screen off) and the program works when you aren't.

It works like a screensaver and you can watch it reading the data received from the far reaches of space. The current unit my computer is reading is from April 09 at 19:39:54 (6:39 pm). The program is really very small and doesn't seem to effect my other programs at all.

You can use it on PC's as well as Macs.