After a two-year hiatus, Hubble Space Telescope is back in business. The computer glitch that halted the telescope’s operations has been fixed, and Hubble is now ready to resume its search for new galaxies and other cosmic phenomena.

The trouble began in September 2008, when one of Hubble’s four onboard computers failed. The malfunction caused the telescope to enter into a protective “safe mode,” which limited its capabilities.

In an effort to restore Hubble to full operation, NASA engineers tried to reboot the failed computer, but to no avail. The problem persisted, and in March 2009, Hubble was officially taken …