The Space Stories That Defined 2021
Looking back at the year's biggest space milestones, from JWST's launch to a record pace of Falcon 9 flights.
Every December I try to write a “year in space” post, and every year I end up cutting half the list because there’s too much to cover. 2021 was no exception, but if I had to pick the single biggest moment, it’s obvious: the James Webb Space Telescope actually launched. After years of delays, cost overruns, and enough “will it ever fly” jokes to fill a comedy special, JWST is now on its way to L2. It hasn’t unfolded yet, and there’s still a nail-biting deployment sequence ahead, but just getting it off the pad this year already feels like a milestone worth celebrating.
The other image I can’t shake from 2021 is Comet Leonard. Catching a naked-eye comet is rare enough that it’s worth stepping outside for, and this one delivered — a genuinely photogenic visitor that a lot of amateur astronomers (myself included) spent December trying to capture with nothing more than a tripod and a long exposure.
Planetary defense got real
November’s launch of NASA’s DART mission deserves more attention than it’s gotten. This is, as far as I know, the first mission explicitly designed to test whether we can nudge an asteroid off course by smashing a spacecraft into it. It sounds almost too simple, which is part of why I like it — no fancy tractor beams or nukes, just kinetic impact and orbital mechanics. We won’t know if it worked for a while yet, but the fact that this is happening at all says something about how seriously the planetary defense conversation has been taken lately.
SpaceX just kept launching
It’s easy to become numb to SpaceX news because they launch so often now, but stepping back, the cadence this year was genuinely wild — north of 30 Falcon 9 launches in a single year. A few years ago that number would have sounded like a NASA-plus-Roscosmos-plus-everyone-else combined tally, not one company’s manifest. Whatever you think of the company or its founder, that launch rate has quietly reset expectations for what “normal” looks like in the launch industry, and I’d expect competitors to keep feeling pressure to match it.
The exoplanet story I didn’t see coming
The one item from this year’s retrospectives that surprised me most: a candidate detection of the first exoplanet found outside the Milky Way, roughly 28 million light-years away in another galaxy entirely. Every exoplanet we’ve confidently identified up to now has been within our own galaxy, so a candidate this far out — found through X-ray transit methods rather than the usual optical techniques — is a big deal if it holds up. It’ll need follow-up observations to confirm, since the transiting object won’t cross in front of its star again for decades, but even as a candidate it’s a reminder of how much of the technique-space for finding planets is still being invented.
Taken together, 2021 didn’t have one singular “moon landing” moment, but it had an unusual density of genuinely novel firsts — a telescope finally reaching orbit, a planetary defense test, a launch cadence nobody would have predicted, and a hint of exoplanets beyond our own galaxy. Not a bad year to close out.