A radar-generated map of the thickness of the layered deposits. Image credit: NASA/JPL-Caltech/University of Rome/Southwest Research Institute/University of Arizona A radar instrument on the Mars Re...

If you had the opportunity this morning to witness the offspring of Comet Halley, then I'm curious as to what you might have noticed about this reliable annual meteor shower. (...) Read the rest ...

Need to know the answer to this week's Where In The Universe Challenge? Find out back at the original post. And check back next week for another test of your visual knowledge of the cosmos! ...

<img class="alignleft size-medium wp-image-44720" title="The Pontifical Academy of Sciences held a "study week" to explore the question of the existence of extraterrestials...