New footage shows NASA astronaut Christina Koch training ahead of her Artemis II mission earlier this year. Astronauts use underwater training because the buoyancy of water creates a near-weightless environment where they neither sink nor float, allowing them to rehearse spacewalks and build muscle memory for handling equipment in space. 🎥 @achintyabairat #nasa #christinakoch #space #artemis

Sisters or dating? #christinaandamberclips #chamber #christinaottrando #amberlawes #christinaandamber