"I pictured myself, hanging on to Hubble, screaming across space at 17,500 mph," he said as his crew mates laughed. " I am looking forward to going outside and crawling on to the Hubble and grabbing on to it, and opening up the doors with Mike and going inside. I think it will be pretty cool. Having watched it go across the night sky and thinking about being there with it as it goes across that should be pretty fun."
Mass said was hoping he would get a few minutes during the hard work to soak in the view.
"There will probably be a few moments when we can just look around because very few people get to see the Earth from that vantage point. It is beyond words. You can't describe how beautiful it is. The closest I can come is to say it is like looking into heaven."
Thursday's spacewalk had the Hubble scientists on the edge of their seats. Spacewalkers John Grunsfeld and Drew Feustel installed a powerful new $132 million camera and a critical data computer on the Hubble Space Telescope that were high priorities for the scientists who run the Hubble.
Early in the day a stubborn bolt holding the old camera into place forced the astronauts to use some extra muscle to get it loosened. If that bolt broke, the old camera could not have been replaced.
Looking into heaven is Hubble's job description. After the astronauts finish their mission, Hubble will be back to "unlocking the secrets of the universe" again.