The cancellation was for NASA Advanced Stirling Radioisotope Generator (ASRG) that would have provided a new generation of plutonium-238 (Pu-238) based electrical power systems. ASRGs could have stretched NASA's limited supply of plutonium to potentially enable missions to the perpetually-shadowed polar craters on our moon, to flyby Uranus, or to float for months on a Titan lake.
Lifeless Ice? At first glance, the cryosphere – including all frozen water on Earth – appears to comprise vast, cold expanses devoid of biology. However, even the most remote, hostile and unlikely icy locations in both hemispheres have been found to harbour diverse and active microbial life. It is hard to imagine ice offering many viable places for microbes to exploit; but liquid water and energy sources exist beneath, within, and especially on the surfaces of glaciers and ice
This week we speak with Kathleen Cullen about how our brains control our eyes and head, why astronauts get sick in space, and more! Dr. Cullen is a professor of physiology, and the director of the Systems Neuroscience and Aerospace Medical Research Unit at McGill University. This episode can also be streamed or downloaded here: NeuroTalk S2E9 Kathleen Cullen
In this image I have assembled photos of skulls (or casts of skulls) of six extant carnivores. I exclusively used photos from the Skulls Unlimited website because they had all the taxa I wanted, lit about the same and photographed from similar angles. The omission of scale indicators is deliberate. Your mission, should you choose […]