Microbes From Space and Bits of Halley's Comet

Hank Green presents SciShow Space News, discussing SpaceX's mission to the ISS, which included delivering bacteria for research. The video also covers the Eta Aquariids meteor shower, originating from Halley's comet, and a new discovery of a brown dwarf by NASA's WISE. The episode concludes with a call to action for viewer engagement.

What is a brown dwarf and how does it differ from a star?

How might the discovery of smaller cooler brown dwarfs help astronomers?