The Hubble telescope came alive after one month of exhausting darkness.

According to a NASA statement after having spent more than one month in orbit around the Earth in "safe mode" NASA's Hubble Space Telescope is back up and running, with all its science instruments fully operational.

The engineers relaunched the satellite – launched in 1990 and built with equipment starting in the 1980s – on Saturday (July 17) after identifying a potential problem in Hubble's power control unit that 'ensures constant voltage supply to the payload computer hardware,' according to NASA.

This payload computer suddenly crashed on June 13, automatically taking all the satellite's scientific instruments offline and placing them in a "safe mode" configuration, Live Science reported earlier. The technicians tried but did not succeed several times in restarting the broken computer.

But last week, NASA engineers discovered that the source of the problem is probably a special protection circuit that prevents the satellite's power control unit from operating sending too much or not enough energy to the payload computer. According to NASA, if the voltage supply exceeds safe levels of operation, the circuit automatically indicates the shutdown of the payload computer.

"The team's analysis suggests that either the voltage level from the regulator is outside of acceptable levels (thereby tripping the secondary protection circuit), or the secondary protection circuit has degraded over time and is stuck in this inhibit state," NASA wrote on July 14.

NASA technicians have worked around this problem by switching operations to the satellite backup computer and activating an emergency power control unit.

With this backup hardware booted up, the satellite should be able to continue observing the cosmos — and hopefully working in tandem with the new James Webb Space Telescope, expected to launch later this year — for many years to come, according to NASA. The programmed space observations that the satellite missed during its month in secure mode will be rescheduled at a later date, the agency added.