Spacetime With Stuart Gary

*Recurring Martian Streaks could be just sand rather than water A new study claims dark streaks often seen on the Sun facing slopes of Martian gullies and ravines could be caused by moving sand rather than melting sub-surface permafrost. The conclusions provide an alternative to previous speculation that the features – known as recurring slope lineae or RSLs – were caused by flowing meltwater from permafrost layers seeping out from the sides of gullies and ravines. *Could cosmic dust be transporting life between worlds? A new study suggests that life on Earth might have originated from biological particles brought to the planet in streams of cosmic dust particles. The findings would mean fast-moving flows of interplanetary dust that continually bombard Earth’s atmosphere could deliver tiny organisms from far-off worlds, or send Earth-based organisms to other planets, according to the research. *Listening for alien signals. Way back on August the 15th 1977 astronomers at Ohio State University’s Big Ear radio t