Claude Nicollier — American Astronaut born on September 02, 1944,

Claude Nicollier is the first astronaut from Switzerland, and has flown on four Space Shuttle missions. His first spaceflight was in 1992, and his final spaceflight was in 1999. He took part in two servicing missions to the Hubble Space Telescope. During his final spaceflight he participated in a spacewalk, becoming the first European Space Agency astronaut to do so during a Space Shuttle mission. In 2000 he was assigned to the Astronaut Office Extravehicular Activity Branch, while maintaining a position as Lead ESA Astronaut in Houston. Nicollier retired from ESA in April 2007... (wikipedia)

In general, the objects in the universe that are very high-energy objects, or the processes that are high-energy processes, will radiate more in the short wavelength range towards the gamma rays or the x-rays.
The future infrared space telescope will cover that area in a much more efficient manner.
I think a benefit is that we try to put it up in a short time. From the decision to do this mission until we fly, it's six months and one week or so, so it's a very short time.
Hubble is very close to my heart, and going back to Hubble, because I was there once already in 1993, is really a great privilege for me.
We have the Fine Guidance Sensors, one of which we will exchange out of three. Another one we changed on the last servicing mission, and on the fourth servicing mission in 2003 or 2004, the third one will be exchanged.