NASA Astronaut Ricky Arnold@astro_ricky

Astronaut (STS-119, Expedition 55/56, NEEMO 13, #CAVES2016) & Educator. Currently onboard the @ISS for Expeditions 55 and 56. Posts are my own.

Salar de Uyuni – the magnificent salt flats of #Bolivia where towering thunderstorms go to die, thus forming the Atacama desert of #Chile


‪The violent beauty of our dynamic Earth revealed by a volcanic plume alongside Lake Atitlán in #Guatemala.‬


A stunning daytime traverse from #SanFrancisco southward through the Americas.


The heart of #Madagascar drains into the sea due to decimation of rainforests & coastal mangroves. #BetsibokaEstuary


Visitors from deep space have visited Earth before and will again. Impact craters in #Quebec #Namibia #Arizona


Recently a student asked me “how long would it take to get to the moon?” This @nasa activity uses balloons to understand the relative sizes of Earth, Earth’s Moon and Mars, and their relative distance to each other. #TeacherOnBoard


…throw off the bowlines. Sail away from safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover…” -Mark Twain


The scattered remnants of the Aral (Sea of Islands) Sea in #Kazakhstan and #Uzbekistan, which used to be the 4th largest lake in the world. Diversion for agriculture has reduced the lake to 10% of its original size, resulting in desertification, economic collapse & public health issues. #TheStoryofWater


Once we captured @spacex Dragon, ground controllers at @nasajohnson took over and berthed it to station. Enjoy the robotic ballet.


The fireworks of #Kilauea early this morning in #Hawaii.


‪We hold these truths to be self-evident, that all men (people) are created equal..”‬
#HappyBirthdayAmerica from @iss! #FourthofJuly2018🇺🇸


It may look like we are preparing for #WorldCup football, but @olegmks and I are really conducting a test run of SPHERES satellites on @iss.