Earth has a second moon, and most people will never see it. It is called 2026 QQ8, it is about two metres across — roughly the size of a small car — and it was captured by Earth's gravity in April.
The discovery was announced by the Minor Planet Center of the International Astronomical Union. The object was first observed in August.
Where it is, and for how long
It takes more than 350 days to go round the Sun, which is close to an Earth year — part of why it was able to be captured at all. At its closest it comes within about 353,000 miles of Earth, roughly 110,000 miles beyond the Moon's average distance.
Researchers reconstructed its path and found Earth's gravity had pulled it into orbit around the planet. It approaches closely about once a decade; this time it came near enough to be caught.
It will stay bound to Earth until December and is expected to break away again in 2027.
Could it have hit us?
Worth answering plainly, because the phrase "object captured by Earth" invites the question. No. Even on a direct collision course, a two-metre rock would have burned up completely in the atmosphere and appeared as a bright fireball. Nothing would have reached the ground.
This is more common than it sounds
A study last year suggested Earth may hold about six mini-moons at any given time. Modelling earlier this year estimated that temporary satellites average about 75 centimetres across and stay for roughly nine months. Objects around three metres wide could remain captured for ten to twenty years.
So Earth is not usually accompanied by one extra moon. It is usually accompanied by several, all of them too small and too faint to see without a powerful telescope.
Some temporary mini-moons are thought to be fragments of the Moon itself, knocked loose by impacts and later recaptured.
Why the detection matters more than the object
A two-metre rock in a wide orbit is not scientifically dramatic in itself. What is notable is that it was found at all.
Finding something this small requires very powerful telescopes, software capable of separating a faint moving dot from a field of fixed stars, and data pooled from scientists worldwide — none of which existed in usable form a generation ago.
That is the quiet shift behind this story and behind the recent run of discoveries in the outer Solar System. These objects were always there. What changed is that the sky is now being photographed often enough, and compared carefully enough, for the things that move to stand out from the things that do not.
Why bother tracking something this small
A two-metre rock cannot hurt anyone, so the effort needs a justification beyond curiosity. There are three.
The first is calibration. Objects that pass close and are tracked over months let astronomers test how well their orbital models predict reality — and those are the same models used for things that are large enough to matter.
The second is access. A captured object a few metres across, already in Earth orbit, is the cheapest asteroid material a mission could ever reach. Several proposed sample missions assume exactly this kind of target.
The third is the awkward one. A survey capable of spotting a two-metre rock at 353,000 miles is a survey capable of spotting a thirty-metre one much further out, with much more warning. The mini-moons are not the point. They are the proof that the net is working.
