On Monday, a team of seven astronauts is scheduled to head into space on a long overdue — and dangerous mission — to repair the Hubble Space Telescope. The Hubble has vastly expanded what we know about the universe, but its batteries, main camera and gyroscopes — devices which accurately point the telescope — all need fixing. If anything goes wrong on this mission, the crew won’t be anywhere near the space station where they could be rescued. For a year ABC News has been given unprecedented, behind-the-scenes access to the crew’s training. At our request, spacewalker Mike Massimino blogged about the training for the mission last January. "For me, the most challenging time during that spacewalk will be when I go inside the telescope to connect the gyros to the telescope," he blogged. "To do this, I worm my way inside very carefully, and then Bueno holds me in position while I do my work as there is no way for me to control and monitor my position in such a confined area without his help. Hopefully he will not twitch or sneeze or burp or do anything that would cause him to even jiggle me because I am very close to some delicate stuff…" Click here to read the his full blog. Massimino opened up on Twitter today about the final preparations: "Putting notes in my flight notebook, making phone calls, and trying my best to relax, adrenaline is starting to flow." We’ll follow the astronauts’ mission from space and bring you their blog entries.