The team running NASA’s nearly 46-year-old Voyager missions hope to get the pair of aging spacecraft to 19 billion miles from the Sun (about 208 AU, or 208 times the distance of Earth’s orbit) with at least one instrument on each spacecraft still sending home information about interstellar space.

To pull it off, they’re racing against nuclear physics, constantly searching for ways to keep the Voyagers’ instruments and radio transmitters running as the radioactive material that powers them steadily decays. But now NASA is considering a clever new plan that may buy the Voyagers a little more time.

Ice is one of the Universe’s most talented shapeshifters.

Under extremely low temperatures and high pressures, the atoms within ice rearrange themselves. This helps explain why scientists have discovered at least 20 different incarnations of ice in the lab, up in space, or deep within the Earth — some of which have no fixed structure at all.

Now, in a happy accident, scientists appear to have created yet another form. Their results, recently published in the journal Science, may offer our first glimpse at a form of ice that looks a lot like liquid water — potentially transforming our grasp of water and its various quirks.

Tracking your health and fitness is no longer just for data-obsessed nerds. Not only are there plenty of smartwatches available with advanced fitness-tracking sensors, but the good ol' fashioned fitness tracker is still alive and kicking — and the latest models offer some pretty high-tech features that can keep your body and mind in tip-top shape.

Wearing a smartwatch or fitness tracker won't instantly make you healthier or fitter; the sensors merely present collected data. And while each wearable interprets the tracked data a bit differently, the overall mission is the same: to provide you with more data so that you can make informed lifestyle decisions.

Whether it's your new year's resolution to improve yourself or you're in the market for an upgrade, we've rounded up the latest and greatest fitness trackers to get.