Chile: Summer and Winter

I've now spent over a year in Chile and have taken pictures from time to time. Here I present two pairs of pictures of approximately the same location, but shifted in time by several months. That is, one picture is taken around Summer, while the other was taken around Winter (or close enough). This showcases how the seasons change here in Santiago and it's a good opportunity to talk about how the seasons work on Earth.

As always, remember that you can click the pictures to see them larger.
More details, and the second picture, after the jump.

Astronomy: Young Stellar Moving Groups

Open cluster M25. Credit:  J.-C. Cuillandre (CFHT), G. Anselmi (Coelum Astronomia), Hawaiian Starlight

Stars are born in groups, as clusters of stars. Some groups stay well-knit and the members remain together many hundreds of millions of years later. Others, however, are loosely bound to each other, and, after traveling a bit through the Galaxy, get dispersed. However, the initial bulk motion of the stars in these groups is preserved. So, if you search carefully, you can find groups of widely separated stars throughout the sky all moving in approximately the same direction and with the same properties like age and composition. These are stellar moving groups, and here I'm going to tell you why astronomers love them.

Poetry: Isildur's Bane

I have had no time to write or even think about my blog in the past few weeks thanks to lots of work deadlines and a bit of traveling. So, to fill up time, I present you with another old poem I wrote. This one recounts the story of Isildur, son of Elendir, and the Last Alliance of Elves and Men. It is not strictly canon in the Lord of the Rings universe, but that's alright: it's just meant for fun.

As before, I'm not a poet so forgive me if the meter, rhyme, or whatever is not quite right.

Four Stars and One Planet

Artist depiction of PH1. Credit: Ron Miller

A really cool new planet discovery has been announced today and I wanted to mention it here for those who haven't heard about it yet.
You may recall the Kepler Space Telescope has been starring at a patch of sky to look for periodic dips in the light of distant stars. Such dips can be caused when planets orbiting those stars transit in front of the star (just like our own Venus transit a few months back). There are so many stars to look through, though, that there is a public program available for anyone interested to look at the data. That's right: ordinary people can look at scientific data and help find planets. This Planet Hunters program is ongoing and has already discovered several planets.
Today, a really cool planet has been discovered by these citizen scientists. Read on to learn more.

Exoplanet Visualizations

If you're interested in astronomy, you're probably aware that we know of hundreds of extrasolar planets -- planets outside our solar system -- and that we have thousands of candidate planets. Many of these new candidates come from NASA's Kepler mission, which looked at the dimming of light when a planet passes in front of another star. By the current count, there are over 2000 such objects identified.

Many people have come up with clever ways to display these planets in a way that's fun and easy to understand. In this post I've gathered some of my favorites (mostly videos) and will walk you through what they show. Click through to check them out!

A Year as a Postdoc Astronomer in Chile

As of October, I have now spent one year as an astronomy postdoctoral researcher straight out of graduate school. It has been a great year, though with plenty of ups and downs. I figure I should write down my thoughts about this experience. I have both good things and bad things to say, but I try to be honest, fair, and positive throughout. This may be of interest to curious grad students, or anyone really, especially if they have wondered about pursuing a postdoc or are just interested in astronomy in Chile. One thing to keep in mind is that this is an individual, personal experience and your own story or circumstances may be quite different. It's obviously difficult to approach this critically and unbiasedly, but here goes nothing...

Book Review: The King's Blood by Daniel Abraham

The King's Blood, by Daniel Abraham, is the sequel to The Dragon's Path, one of my top 5 books of 2011. The story continues where we left off with mostly the same characters. Not sure if I'll have the sequel among my top 5 this year, since I've read so many other good books in 2012.

A tyrant's power increases with the help of priests of a ravenous Goddess while a young banker struggles to hold on to her bank. Things are going to get messy as war breaks out in the lands once ruled by dragons.

Read on, to find out what I thought.

Chile on September 18

September is a month of history in Chile. Back on September 11, we saw the remembrance of the military coup that overthrew Allende and established the Pinochet dictatorship. Today, however, we go further back in history: to September 18, 1810 and the first steps in Chile's independence. From my readings, it looks like there were many notable dates throughout the process for independence, but September 18 is celebrated as the Day.