It had never occurred to me to think about geostationary satellites in Mars orbit before reading a new paper by Juan Silva and Pilar Romero. The paper shows that it takes a lot more work to maintain a stationary orbit at an arbitrary longitude at Mars than it does at Earth.
I'm absolutely floored when I stop to think that our beautiful blue ocean is only one of perhaps a half dozen or more oceans on other worlds in our solar system, and only one of probably millions (or more) oceans on other Earth-like planets in our galaxy. Oceans abound!
With the Landsat Data Continuity Mission scheduled to launch on Monday, there's been a lot of Tweeting about Landsat, and through one such Tweet I learned about a resource that I hadn't known existed before: the LandsatLook Viewer. This is a graphical interface to more than a decade worth of Landsat data, a tremendous resource for anyone interested in Earth's changing surface, natural or manmade.
It's taken me a year to face the emotionally draining task of reading and writing about Galileo's cruise phase as chronicled in the mission's newsletters.
Posted by Björn Jónsson on 2012/11/13 05:24 CST
This is a very large (19000 pixels square) mosaic of the fjords and glaciers of southern Greenland. I had been interested for a long time in experimenting with the processing of Earth satellite imagery just to get a comparison to the other planets.
Posted by Emily Lakdawalla on 2012/10/29 11:32 CDT
Today hurricane Sandy is a major threat to life and property across the west coast of the northern Atlantic ocean. I just want to give thanks in advance to all the people who have devoted their careers to making sure that Americans have sufficient warning of devastating, unstoppable weather events like this one.
Posted by Bruce Betts on 2012/05/08 03:43 CDT
Evidence continues to pile up that the Rio Vichada structure in Colombia is indeed the largest impact structure in South America.
Last week, India launched RISAT 1, a new Earth-observing satellite. How does its synthetic aperture radar compare to that of Envisat, which has fallen silent?
Posted by Neil Patrick Stewart on 2012/02/16 02:17 CST
Last week, I received a press release with the headline "Big Bend National Park Designated As International Dark Sky Park." I asked my brother Neil to write something about this announcement for me.
Posted by Emily Lakdawalla on 2012/01/26 03:55 CST
I ran into a semantic problem today: what to call the science of studying liquids on Titan?