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No Place Like Home

Bill Dunford • April 21, 2013

Mars and Earth share a truly striking family resemblance, but there's no mistaking which one is home.

Messages of Wonder

Bill Dunford • March 18, 2013

Some lovely, rarely-seen images from the MESSENGER mission.

Pretty picture: a moon transit

Emily Lakdawalla • February 21, 2013

A reader comment inspired me to dig up an oldie but a goodie: a sequence of photos of the Moon transiting Earth, seen from a very long way away,

A forgotten image of Earth and the Moon

Emily Lakdawalla • February 13, 2013

While researching another story, I came across an image I don't remember ever seeing before, of a moonrise from an unexpected source.

The Earth is a Planet: Why We Explore Space

Bill Dunford • February 11, 2013

Why spend effort and scarce resources on space exploration when we have so many problems here at home? Turns out, there are some pretty good reasons.

Browsing Landsat data is a lot easier than I thought it was

Emily Lakdawalla • February 08, 2013

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.

Galileo Messengers: Cruise to Venus, Earth, Gaspra, Earth, Ida, and almost to Jupiter

Emily Lakdawalla • February 05, 2013

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.

Pretty picture: Landsat view of southern Greenland

Björn Jónsson • November 13, 2012

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.

Hurricane Sandy: Thanks for lives saved already

Emily Lakdawalla • October 29, 2012

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.

Birth of a New Moon

Emily Lakdawalla • July 05, 2012

As astronaut Don Pettit prepared for his return to Earth, he tweeted several beautiful shots from the Space Station.

Talking Climate With Bill Nye

Mat Kaplan • July 03, 2012

Talk about changing climates on this world and others brought 600 people to the Boulder Theater.

A solar eclipse - as viewed from the Moon

Emily Lakdawalla • May 28, 2012

A solar eclipse isn't just a spiffy sight to Earthlings; it looks pretty cool to lunar dwellers as well.

More Evidence for Impact Origin for Colombia’s Vichada Structure

Bruce Betts • May 08, 2012

Evidence continues to pile up that the Rio Vichada structure in Colombia is indeed the largest impact structure in South America.

Examining India's new RISAT 1 Earth observation satellite

Jason Davis • May 02, 2012

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?

Big Bend designated International Dark Sky Park

Neil Patrick Stewart • February 16, 2012

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.

Six days in the crater (day one)

Pat Donohue • February 03, 2012

This is the first in a series of posts based on field notes and memories supplemented by background reading material from the Meteor Crater Field Camp that was held from October 17-23, 2010.

Parallel planetary processes create semantic headaches

Emily Lakdawalla • January 26, 2012

I ran into a semantic problem today: what to call the science of studying liquids on Titan?

Evaporites on Titan

Emily Lakdawalla • January 12, 2012

Evaporites form on planetary surfaces when dissolved chemical solids precipitate out of saturated solution as their liquid solvent evaporates and, until recently, were known to exist only on Earth and Mars. This article from the IAG Planetary Geomorphology Working Group describes the third planetary instance of evaporite, discovered on Saturn's moon Titan.

Steno's principles and planetary geology

Emily Lakdawalla • January 11, 2012

The Google Doodle for January 11, 2012 celebrates Nicholas Steno, one of the founding fathers of modern geology, on the occasion of his 374th birthday. This article describes Steno's set of rules that guide geologists in reading rocks to tell the story of how a place came to be and how the rules are currently used in geology.

The state of Earth observation, January 2012

Jason Davis • January 09, 2012

As of November 2011, the Earth Observing Handbook counts 109 active missions to study the Earth as a planet, with 112 more approved and planned for the future. Jason Davis provides an overview of key current and upcoming earth-observing missions.

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