The Accelerating Expansion of The Universe (start at 5:11). Have you ever had the feeling that things are moving faster and faster these days? Well, maybe it’s not your imagination. Proof that the universe is not just expanding but is accelerating garnered a Nobel Prize last year. To help explain what’s going on, we talk to Dr. Adam Riess, a professor of physics and astronomy at the Johns Hopkins University and is a scientist at the Space Telescope Science Institute in Baltimore. When he was a research fellow at the University of California, Berkeley, from 1996 to 1999, Dr. Riess and his colleagues conducted the research that was to win him a share of the 2011 Nobel Prize in physics. The citation for the prize stated it was: “for the discovery of the accelerating expansion of the Universe through observations of distant supernovae.” In today’s show, Dr. Riess translates what that means and the implications about the ultimate fate of the universe.
Pine Bark Beetles (start at 19:22). The tree-killing pine bark beetles used to breed once a year. Warming annual temperatures now allow them to breed twice, resulting in 60 times more offspring. Hungry, tree-eating offspring. University of Colorado biologists Jeff Mitton and Scott Ferrenberg have just published their findings that the doubled-up breeding season explains why the recent pinebark beetle epidemic has killed so many trees. And it’s not over yet. How on Earth’s Shelley Schlender talks with the scientists about which trees are the most vulnerable to pinebark beetles. You also can hear the extended version of that interview.
Hosts: Joel Parker, Beth Bartel
Producer: Joel Parker
Engineer: Jim Pullen
Headline Contributor: Susan Moran
Executive Producer: Shelley Schlender
Listen to the show:
Podcast: Play in new window | Download (Duration: 24:11 — 22.1MB)