As noted by CNET, NASA launches the application as part of a memorial to Spitzer, who now has been around in space for 15 years.
Using the NASA application Selfies very easily. You simply take a photo with your smartphone and select the photos to be a space background. Background options that there are diverse, ranging from the Andromeda Galaxy to Zeta Ophiuchi, a giant star that is in the ranks of stars of Ophiuchus.
This application will then paste your face onto the space suits and helmets a little information about your selected photos as a background. NASA Selfies already available for Android and iOS.