1.   The spacewalkers will equip the five-story telescope with two large new science instruments and install up to eight other electronic upgrades.

2.   They plan to install two major new celestial detectors and other electronic upgrades.

3.   Thursday night, two of the astronauts are to begin the first of four, lengthy back-to-back spacewalks to install two large new science instruments and other electronic upgrades.

4.   With electronic upgrades, a reservations agent handles the entire transaction.