Hubble Space Telescope’s Computer Is Still Down – Here’s What NASA Is Trying Now

Hubble Space Telescope Is Deployed

The Hubble Space Telescope is deployed on April 25, 1990 from the space shuttle Discovery. Avoiding distortions of the atmosphere, Hubble has an unobstructed view peering to planets, stars and galaxies, some more than 13.4 billion light years away. Credit: NASA/Smithsonian Institution/Lockheed Corporation

NASA is taking additional steps to investigate the Hubble Space Telescope’s payload computer issue that began on June 13, suspending science observations. In parallel with the investigation, NASA is preparing and testing procedures to turn on backup hardware onboard the spacecraft. The telescope itself and science instruments remain healthy and in a safe configuration.

The source of the computer problem lies in the Science Instrument Command and Data Handling (SI C&DH) unit, where the payload computer resides. A few hardware pieces on the SI C&DH could be the culprit(s).

The team is currently scrutinizing the Command Unit/Science Data Formatter (CU/SDF), which sends and formats commands and data. They are also looking at a power regulator within the Power Control Unit, which is designed to ensure a steady voltage supply to the payload computer’s hardware. If one of these systems is determined to be the likely cause, the team must complete a more complicated operations procedure to switch to the backup units. This procedure would be more complex and riskier than those the team executed last week, which involved switching to the backup payload computer hardware and memory modules. To switch to the backup CU/SDF or power regulator, several other hardware boxes on the spacecraft must also be switched due to the way they are connected to the SI C&DH unit.

Over the next week or so, the team will review and update all of the operations procedures, commands, and other related items necessary to perform the switch to backup hardware. They will then test their execution against a high-fidelity simulator.

The team performed a similar switch in 2008, which allowed Hubble to continue normal science operations after a CU/SDF module failed. A servicing mission in 2009 then replaced the entire SI C&DH unit, including the faulty CU/SDF module, with the SI C&DH unit currently in use.

Since that servicing mission, Hubble has taken over 600,000 additional observations to exceed 1.5 million during its lifetime. Those observations continue to change our understanding of the universe.

Launched in 1990, Hubble has been observing the universe for over 31 years. It has contributed to some of the most significant discoveries of our cosmos, including the accelerating expansion of the universe, the evolution of galaxies over time, and the first atmospheric studies of planets beyond our solar system.

2 Comments on "Hubble Space Telescope’s Computer Is Still Down – Here’s What NASA Is Trying Now"

  1. Sekar Vedaraman | July 2, 2021 at 6:51 am | Reply

    Best of luck.

    The problem can be fixed
    if addressed systematically.

    31 years usage is like a mili micro second in the estimated life of the planet.

    Annual upgrades and ensuring on- board spares and robots are par for the course and is common sense for such a expensive efforts from a risk management perspective.

    In the 1990s we used Mainframe computers. The same power is used by a five/ten year old with laptop for gaming applications.

    Every time Moores Law improves computing and processing capability, it may be cost effective to overhaul the eye in the sky computers which gives a clear view. Not once in 18 years.

    Views expressed are personal and not binding on anyone.

  2. Peter M Foster | July 2, 2021 at 5:47 pm | Reply

    Every time you send it receive data to it, you give away information. It is a security breach and the unit has been compromised by units who are tired of being spied upon, like very soon, we all will be under the watch of some local real time surveillance center and their companies, or others who have a coded access. See NYs real time surveillance center opening announcement for the oneida county center, or any of the other more than 31 centers in NY. From infrared to ultraviolet. Mci, coradiant and these things, or devices, that most of those mesmerized do not see. Constant tracking and imaging. Think about the future and what it will be like for your children. Lased tasers masers, ie. oh let’s eat away at that persons esophagus,and give them all a virus. Especially if they question these authorities. Tell me please, if you can, Where the legislative powers of the area give those legislations any power over the people. Especially like article 700, nycpl.

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