All that said, the findings can’t confirm the terrestrial life theory beyond a doubt. There’s still a chance hydrogen-heavy meteorites helped us along. Still, the new evidence makes a strong case that ancient Earth had the ability to form water all on its own—no space rocks needed.

Scientists have long questioned whether an early Earth could have contained the appropriate hydrogen and oxygen on its own to create the water on our planet.

The space rock dates to around 4.6 billion years ago and is believed to be similar in composition to early Earth, according to a study published Wednesday in the journal Icarus. The researchers found that the majority of the hydrogen contained within the meteorite was intrinsic,