Nine years ago, the New Horizons space probe was launched, and one of its targets for exploration was, at the time, billions of miles away from Earth. That target was Pluto, and at the time of the launch, Pluto still was considered a planet. But even though Pluto has been downgraded, the expected “arrival” of New Horizons, which will come within an estimated 7,800 miles of Pluto at around 7:49 a.m. ET, is an exciting scientific achievement. Already, detailed photographs relayed from the spacecraft have provided the first accurate measurements of Pluto’s size (about 1,473 miles in diameter). And today, from 7:30 to 9 a.m. ET, NASA TV is providing live coverage from mission control – so even if we can’t see the latest images until they’re fully processed and reconstructed, we get to see the team in action.