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.
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.
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.