Hubble deserves a rescue attempt, but only if NASA is honest about the risk

Do we build great observatories to use them, or to maintain them? For most of Hubble's life the answer was obvious, because astronauts kept visiting. Now NASA is asking, in effect, whether we still believe in that answer.

NASA hasn't promised a rescue, only asked who could pull one off

According to NASA, the agency issued a Request for Information on Oct. 29 to learn what industry can do to support Hubble in orbit. The options on the table, as Talk of Titusville's summary of the notice describes them, are to capture the telescope and boost it to at least 600 kilometers (about 372 miles), to fly a servicing mission that makes it more resilient and extends its life, or to capture it and steer it into a controlled reentry.

It is a request for information, not a contract. The summary on Digg says NASA expects a boost or servicing mission by 2032, and that responses are due November 30. It also says the notice cites a July 2026 analysis that puts the probability of Hubble's reentry at 50% by December 2033. That is the clock behind the paperwork.

The deorbit option is a decision, not a default

The most important thing about this notice is that it puts a controlled reentry on the same page as a rescue. We think that is healthy. The Register notes that the last servicing flight, STS-125, launched on May 11, 2009. Hubble has no propulsion of its own to fight atmospheric drag, as Aviation Week points out. So "do nothing" is not neutral. In our view it is a slow version of the deorbit option, and the timetable is set by physics rather than by NASA.

KeepTrack puts Hubble below 500 km with a median reentry forecast of mid-2033. It also lists one-gyro mode and cost among the reasons the reboost question has reopened. Those details matter. A telescope that is already operating in one-gyro mode is not a pristine asset waiting for a tow. It is an aging machine whose remaining science has to be weighed against the price of saving it.

The case for trying is bigger than one telescope

Hubble is, per NASA, the only telescope designed for servicing by astronauts in space. Five servicing missions extended its life and let it absorb new technology. In our view, that design philosophy is the real legacy, and walking away from it without testing whether a commercial replacement for the Shuttle can work would be a strange way to honor it.

There is also a broader payoff. If a company can rendezvous with a large spacecraft and push it to a higher orbit, that capability is useful well beyond one telescope. It would show whether servicing can be a routine tool for expensive science, and not only a nostalgic memory. We would also argue that even the controlled-reentry branch needs a capture vehicle. Whatever happens, someone has to learn to grab Hubble.

Enthusiasm is cheap, so the risk case and the money must be spelled out

Here is where we want to be careful. A NASA page about a study with SpaceX, which we can't date, said there were no plans for NASA to conduct or fund a servicing mission. That may not reflect the agency's current position, but it is a reminder that a request for information does not come with a budget. Developments Today reports that high operating costs would have to come down before a reboost makes sense. Those are not minor footnotes.

We think a botched capture could damage the very instrument it is meant to save, and a failure near the end of Hubble's life could turn a graceful retirement into a debris problem. A credible plan must therefore say, in plain numbers, what happens if the grapple fails and who pays for it. It should also say how much science Hubble can still deliver per year of added life. If proposals avoid those questions, NASA should treat that as a warning sign.

Back the attempt, but make the proposals show their math

Back the attempt, with conditions. We would ask NASA to publish the risk assessment along with the selection, to define in advance what failure looks like, and to keep the controlled deorbit funded as a real fallback rather than a bluff. If the responses can't make that case by the time they are due, the agency should say so and go with the controlled reentry. Letting a famous telescope fall into the atmosphere out of inertia would be the worst of the three choices. A clear, honest decision either way is better.