Some curious dolphins seemingly wanted to give a personal “welcome home" to the Crew-9 astronauts, moments after they splashed down off the coast of Florida on Tuesday afternoon.

The rockets are expensive, whether they use liquid or solid fuel, so the West German Ministry of Transport asked jet-propulsion experts to evaluate hot-water rockets, a prewar German idea that ...

DR YAN WONG:'Pumping air into the bottle 'causes the pressure inside the rocket to build up and that's what pushes the water out of the back of the bottle and propels it into the sky.' DR YAN WONG ...

If all goes according to plan, the Athena lander will touch down near the moon's south pole on or around March 6.