Spacetime With Stuart Gary

Hello and welcome to SpaceTime with Stuart Gary, Series 26 Episode 84. Coming up on this episode: another milestone for NASA's Parker Solar Probe, gullies on Mars potentially formed by recent meltwater, a new study challenges the origins of Earth's water, and more. [NASA's Parker Solar Probe] NASA's Parker Solar Probe has achieved another milestone, completing its 16th close approach to the Sun. During this 16th orbit, the spacecraft reached its perihelion on June 22, coming within 8.5 million kilometers of the Sun's visible surface while traveling at a staggering speed of 587,000 kilometers per hour. [Martian Gullies Formed by Meltwater] Scientists have made a fascinating discovery on Mars. They have found gullies that appear to have been formed by recent liquid meltwater. Published in the journal Science, these findings provide new insights into the role of water from melting ice in shaping ravine-like channels along the sides of impact craters on the Red Planet. [Debate Over Earth's Origins Continues] The