Dr. Al Grauer hosts. Dr. Albert D. Grauer ( @Nmcanopus ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. travelersinthenight.org Today's 2 topics: - Asteroids are part of our environment. An SUV sized space rock has spent eons traveling through the silent vacuum of space. In the past 50 years, without humans being aware of its existence, it has made 29 close approaches to planet Earth and 11 visits to the vicinity our sister planet Venus. In the relatively near future asteroid hunters will be able to find more space rocks like this one before they impact Earth and thus be able to issue a warning for a space rock which is about to explode over a populated area.  - There is increasing evidence that Jupiter's moon Europa, Saturn's moon Enceladus, and other bodies in our solar system have oceans of salty liquid water in contact with warm rock layers. We know that on Earth life abounds under these conditions around volcanic vents. Could such biodiversity be happening elsewhere?   We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.  Just visit: https://www.patreon.com/365DaysOfAstronomy and donate as much as you can! Share the podcast with your friends and send the Patreon link to them too!  Every bit helps! Thank you! ------------------------------------ Do go visit http://www.redbubble.com/people/CosmoQuestX/shop for cool Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness! http://cosmoquest.org/Donate This show is made possible through your donations.  Thank you! (Haven't donated? It's not too late! Just click!) ------------------------------------ The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.