This is an image of the painting on the artist's (Robert Rauschenberg) official website. It is important to note the box of apples, the astronaut, the late president John F. Kennedy, and the smoke cloud from what can be presumed to be an atomic bomb.
The official Wikipedia page for the artist. His style of art is interpretive work, leaving it to the viewer to make what they want of the image. Rauschenberg specializes in collages, like Retroactive 1, and was awarded the "Leonardo da Vinci World Award of Arts in 1995 in recognition of his more than 40 years of fruitful artmaking."
An unofficial, yet very insightful, analysis of the painting. This blogger breaks down all the components of the art-piece, and explains all of the symbolism in the images.
One interesting thing about this piece is that it led to a very similar-looking sequel. What do you make of this?
This is a short video explaining the piece (skip for purposes of the presentation as it doesn't add much new info, but if you'd like to delve more into this artwork, watch this video on your own time).