web link to marketplace: https://market.android.com/details?id=gov.nasa.jpl.spaceimages.android&feature=search_result FREE, COOL, NEW, OFFICIAL US. GOVERNMENT NASA / JPL / CAL TECH app WITH THOUSANDS OF WALLPAPER PICS FROM DECADES of different satellites, space shuttle missions, space probes, etc. APP HAS OVER 15 CATEGORIES! HIGH QUALITY. LIMITED PERMISSIONS. SEARCH "space images" in market in your phone. don't be fooled by other crappy apps. look for the OFFICIAL NASA logo. a link to add cool wallpapers to your home pc: "The Space Images app works together with NASA JPL’s newly launched Space Images website at http://www.jpl.nasa.gov/jplimages, so you can always have a view of space on the go (via Android, iPhone, and iPad) or at your desk." app saveable to your external sd card, so remember to do so. downloaded pics automatically save to your internal sd card, so remember to move them to your external sd card ofter downloading them. literally unlimited hours of fun looking at photos, even if you don't download, and fun for kids. download it now, for the love of god! OFFICAL NASA PHOTOS, DIRECTLY FROM NASA, AND FOR FREE! WHAT COULD BE BETTER???