The test lasted a month and was intended to see which creatures would survive and which wouldn’t.
If you’re a lizard, we have good news but if you’re a mouse, not so much.
The Russian test capsule contained mice, newts, snails, lizards, gerbils, crawfish and a few other critters.
All the lizards came home alive but more than half of all of the rodents on-board didn’t make it.
One researcher told the AP "this is the first time that animals have been put in space on their own for so long."
The deeper goal of the month long flight was to study the effect weightlessness on cell and bone structure and they believe enough of the animals were alive to do so. The bottom line, to see how people might respond during a flight to and from Mars.
The Russians did say the majority of the animals likely died during an equipment malfunction.