Counting craters on Pluto's largest moon Charon shows that there aren't enough of the small ones. Thus, there may have been many fewer small impacting objects (under 1-2 km wide) in the outer solar system in primordial times than previously thought. #GAM2019 #RandomAstroFact

The search for a theorized 9th planet in our solar system hasn't found it yet. But it has turned up a dim object that's about 3x farther from the Sun than Pluto (preliminary estimate), or 140x farther than Earth. Fittingly, it's been nicknamed FarFarOut. #GAM2019 #RandomAstroFact

Stay in your lane! Jupiter's inner moons orbit in the direction that Jupiter spins (“prograde”). The outer moons orbit the opposite way, except Valetudo. The tiny body is speeding like a wrong-way driver on a NASCAR racetrack. Will it come to a bad end? #GAM2019 #RandomAstroFact

In 1987 a supernova in the nearby Large Magellanic Cloud was accompanied by detection of 25 neutrinos from the explosion by underground detectors. Now Japan's Super-Kamiokande neutrino observatory will search for neutrinos from more distant supernovae. #GAM2019 #RandomAstroFact

50 years ago, Armstrong & Aldrin walked across the Apollo 11 landing site. Later, the crews of Apollo 15, 16 & 17 explored while riding battery-powered, 4-wheel rovers (“Moon buggies”). No traffic jam was encountered by these ultimate off-road vehicles. #GAM2019 #RandomAstroFact