For the second time this year, the Hubble Space Telescope has experienced a glitch that has caused some of its functions to stop working.
NASA made the announcement late Monday, saying the ageing space telescope's science instruments went into 'safe mode' after it experienced 'synchronization issues with internal spacecraft communications.'
'Science observations have been temporarily suspended while the team investigates the issue,' the U.S. space agency added in a tweet.
'The instruments remain in good health.'
The Hubble Space Telescope experienced a glitch for the second time this year
It science instruments went into 'safe mode' on October 25 after it suffered from 'synchronization issues with internal spacecraft communications'
When the Hubble is in safe mode, it does not observe any celestial objects or collect data, but it is still powered up.
A NASA spokesman confirmed to DailyMail.com on Wednesday that the Hubble is still in safe mode.
The Hubble, which has been in space more than 30 years, first stopped working in June after it ran into issues with a 1980s-era computer that controls its science instruments.
On June 14, flight controllers at NASA's Goddard Space Flight Center in Maryland tried to restart the computer after they noticed it stopped working on June 13, but they ran into the same issue and could not get it to operate normally.
In June, the Hubble stopped working after it had issues with a 1980s-era computer that controls its science instruments
Science operations on the Hubble resumed on July 17, following a month in which it was halted due to a technical malfunction.
The agency successfully performed a 'very risky' maneuver to switch the Hubble to its backup computer.
The switch 'was performed to compensate for a problem with the original payload computer that occurred on June 13 when the computer halted, suspending science data collection.'
The switch, which started on July 15, involved bringing the backup Power Control Unit (PCU) online, as well as the backup Command Unit/Science Data Formatter (CU/SDF) on the other side of the Science Instrument and Command & Data Handling (SI C&DH) unit.
The PCU brings power to the SI C&DH components, while the CU/SDF sends and formats commands and data.
NASA added that other pieces of hardware on the Hubble were also switched to alternate interfaces to connect to the backup SI C&DH.
Prior to being switched on in July, the backup payload computer had not been powered on since it was installed in 2009 during Hubble's last servicing mission.
Hubble, a joint project of NASA, the European Space Agency and the Canadian Space Agency, has been observing the universe for over three decades.
It has taken more than 1.5 million observations of the universe, and over 18,000 scientific papers have been published based on its data.
The telescope orbits Earth at a speed of about 17,000mph (27,300kph) in low Earth orbit at about 340 miles in altitude, slightly higher than the International Space Station.
Launched in April 1990 from the Kennedy Space Center in Florida, Hubble is showing more and more signs of ageing, despite a series of repairs and updates by spacewalking astronauts during NASA's shuttle era.
The telescope is named after famed astronomer Edwin Hubble who was born in Missouri in 1889 and discovered that the universe is expanding, as well as the rate at which it is doing so.
The Hubble recently marked its 31st anniversary in space, doing so with an image of a giant star that is 'on the edge of destruction'.
The U.S. space agency is going to replace the Hubble with $10 billion James Webb Telescope.
Following months of delays, the James Webb Telescope will launch into space on December 18, 2021, on board the ESA's Ariane-5 rocket.
Earlier this month, the telescope was successfully unpacked in French Guiana, where it will head into space, following a 5,800 mile-long journey.
NASAs Hubble Space Telescope is still working and has made more than 1.3 million observations since its mission began in 1990
The Hubble telescope was launched on April 24, 1990, via the space shuttle Discovery from Kennedy Space Centre in Florida.
It is named after famed astronomer Edwin Hubble who was born in Missouri in 1889.
He is arguably most famous for discovering that the universe is expanding and the rate at which is does so - now coined the Hubble constant.
The Hubble telescope is named after famed astronomer Edwin Hubble who was born in Missouri in 1889 (pictured)
Hubble has made more than 1.3 million observations since its mission began in 1990 and helped publish more than 15,000 scientific papers.
It orbits Earth at a speed of about 17,000mph (27,300kph) in low Earth orbit at about 340 miles in altitude.
Hubble has the pointing accuracy of .007 arc seconds, which is like being able to shine a laser beam focused on Franklin D. Roosevelt's head on a dime roughly 200 miles (320km) away.
The Hubble telescope is named after Edwin Hubble who was responsible for coming up with the Hubble constant and is one of the greatest astronomers of all-time
Hubble's primary mirror is 2.4 meters (7 feet, 10.5 inches) across and in total is 13.3 meters (43.5 feet) long - the length of a large school bus.
Hubble's launch and deployment in April 1990 marked the most significant advance in astronomy since Galileo's telescope.
Thanks to five servicing missions and more than 25 years of operation, our view of the universe and our place within it has never been the same.