Space at SXSW

I was lucky enough this past week to be a part of the South by Southwest (SXSW) Interactive conference in Austin TX. For the uninitiated SXSW is a film and music festival plus a conference about internet business and culture. It's a mecca for all things cool and new on the web. There is so much that goes on there that it's impossible to attend any more than a small fraction of the planned events. This year included some panel talks that directly involved space and science. In my opinion the best one was Moon 2.0: The Outer Limits of Lunar Exploration.

To the Moon

The panel was made up of 5 people representing the diversity of ways that both NASA and private space companies have used social media to reach out to the public and generate interest in space travel. They also talked about the future of space travel — both manned and unmanned — and their thoughts about private space ventures taking the lead in innovation while allowing more people than ever to be involved directly in, and getting to, space.

There were two people on the panel who represented NASA and how they have embraced services like twitter and facebook to try and rekindle the public's love of space travel. Veronica McGregor works for NASA JPL and got the ball rolling in 2008 by creating a twitter account for the mars lander Pheonix. She gave the lander a personality by tweeting about the science it was doing in an engaging and often humorous fashion. It was so successful in getting the public's attention that NASA started creating similar accounts for all it's robotic interplanetary missions. We also heard from Nick Skytland — a project manager in Houston who works with the manned spaceflight missions. He showed how the Astronauts have been able to use twitter to directly connect with people and not just while they are on the ground training, but in space too thanks to a real time internet downlink added to the ISS in January of this year.

Astro_Mike tweets about readjusting to gravity

Astro_Mike tweets about readjusting to gravity

NASA isn't the only player in space anymore. We now have several private space companies developing both manned and unmanned missions. One such group is Masten Space Systems based in Mojave California. The company is headed up by David Masten who was also on the panel. He talked about his company's involvement in one of the many challenge prizes that have popped up recently in an attempt to kick-start the private space industry. Masten won the million dollar level two lunar lander challenge this past year.

Speaking of challenge prizes another panelist was Amanda Stiles who works for the Google Lunar X Prize, a $20 million dollar prize for the first team who can land a robot on the Moon that can move at least 500 meters and send back at least 1 Gigabyte of HD image data. This is just one prize in a long history of prizes that have spurred on innovation and even created entirely new markets. There are currently at least 20 teams competing for the prize.

The final speaker Cariann Higginbotham is co-owner and co-host of spacevidcast.com, a popular podcast that covers all things space. She and her husband formed spacevidcast and share videos of shuttle launches and other important events live on the web. She talked about how NASA and the major media outlets have made space commonplace, but not in a good way. She has worked hard to remind us that launching something into space is an amazing achievement even if it happens fairly often. And people have been listening, the web has proven a great place for like-minded people to get together and talk about a subject they are excited about.

To Infinity and Beyond

It used to be [that we thought in the future] that an astronaut wouldn't be a job, but a certification to do some other, normal job.
David Maston - SXSW 2010

The one thing all the panelists have in common is the belief that space will play a big part of the future and that it will be more collaborative, more international, and more participatory. Dave Masten pointed out that during the Apollo years we thought we could do anything, and that everyone who wanted to could live space, even if all they did a normal job. There would be a place for the accountants and the janitors in space too. But during Apollo our investment in NASA was about 5% of the national budget, while now it's less than 1% percent. Somewhere in between we won the space race, but lost interest. Now we are entering a new era of private space and renewed public interest.

Technology has now come far enough that smart, dedicated people can start building advanced rockets in their garages. In fact that's what I do. We no longer have to rely on large institutionalized space programs to get to space. It's a very exciting time to be a rocket scientist.

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Distance and Scale

I was thinking about the scale of the universe the other day (not an unusual activity for me) when I noticed that an “o” and a period are usually about the right size to be the Earth and the Moon respectively. Then I realized that one could write a sentence such that an o would be there right distance away to be a little model of the Earth–Moon system. So here is a little graphic I made to show this:

Distance from the Earth to the Moon

Distance from the Earth to the Moon

It's amazing to think how far away the moon is when you look up at it. Even more amazing that people actually went there and walked around on it!

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My First ISS Photo

I've never actually tried to take a picture of the International Space Station before. I have a camera and a tripod and the time, but for some reason I never got around to it. That changed when I heard that there would be a pretty good sighting in Portland tonight.

I set up my camera (a Nikon D80, if you're curious) in the backyard, took some test photos then waited. Waiting for the pass was a little surreal because I was watching the ISS slowly circle the earth on my iPod. As the minutes ticked by I saw a little animated dot draw closer and closer on the screen in my hand, knowing that dot represented 5 human beings madly circling the Earth at over 17,000 miles per hour. Right on cue a fine dot appeared — not on a screen — but in the sky. I pressed the shutter release and watched joyfully as the bright point of light streaked across the sky.

Something about space, about people leaving this planet, to learn, to experiment, or even if for no other reason than because they can, excites me like little else. And finally I captured a little piece of that excitement for myself in a photograph.

The ISS From My Backyard

The faint streak in the bottom third of the photo is the space station, faithfully orbiting the earth every 90 minutes. (click for a larger version)

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Space Shuttle Mystery

Last week space shuttle Endeavour launched on a mission to add one of the last pieces of the International Space Station. It was one of the last space shuttle launches and likely the last ever night launches. Among the people watching the launch was James Vernacotola who had his camera ready and waiting on a bridge in Ponte Vedra, Florida, about 115 miles north of the launch pad. He opened the shutter for a little over two minutes and captured this stunning time lapse photo of the launch.

Night time Space Shuttle Launch

Night time Space Shuttle Launch © James Vernacotola

Now, I think I know a thing or two about shuttle launches. I was looking at how the bright glow of the solid rocket boosters faded as they ate up their fuel and as the shuttle gets further and further away. But, hold on, about two thirds through the flight the glow appears to get brighter again. Quite a bit brighter really. And the color changes slightly. I had no idea why. So I set to find out. The fist thing I did was ask the internet via twitter, bu no one responded with an explanation that made sense. I was theorizing with my friend and astronomy lab teacher extraordinaire Adam and we came up with a couple of ideas. Perhaps the shuttle rolled so that the engines came into view better? Or maybe it was just a trick of the clouds reflecting more of the light? Perhaps it was the engines throttling up after breaking through most of the atmosphere? We had theories, but how to test them?

The first thing I did was to rule out the effect being an artifact. So I looked up other time lapse photos of other night launches. Lo and behold, the same brightening happens in all of the launches! It's far to unlikely that the same pattern if it were an artifact would happen during different launches at different times of the night seen from different angles from different cameras, so the phenomenon must be real. Which one of the explanations would it be? After debating the various likelihoods of our theories Adam pointed out that simply knowing when the brightening was happening would tell us a lot.

To figure out the timing I had do some work. Since I knew the exact place where the photo was taken I knew I should be able to recreate the scene in Google Earth. Hopefully this would tell me something. But first I need info on the launch. Luckily a company specializing in space system tracking already posted a path of the launch! But it was missing the times. So I took a time table augmented with latitude, longitude and altitude and wrote a script in python to add points to the Google Earth track.

STS-130 Launch from Google Earth

STS-130 Launch from Google Earth

Each point is about 5 seconds apart. What does this tell us about the launch? If I take the info from Google Earth and overlay it on the original I found that out of our two main theories neither could be correct! In fact the brightening happens after SRB burnout and separation! (and long, long after the roll maneuver)

Night shuttle launch labeled

The labeled image © James Vernacotola

Maybe my analysis was wrong? To double check I did the same Google Earth trick to a an image of another launch and found the exact same thing. It brightens a few seconds after SRB separation. This is also supported by the coloring. As the SRB's burn out the predominate color goes from orange (from the solid fuel of the boosters) to blue (from the hydrogen burning shuttle engines). The question remains why it get brighter. I'm still not entirely sure, but the SRB's continue to burn and spew exhaust gases after separation. They also tumble and spin. Perhaps slowing down and tumbling is enough to make them look brighter. Also during separation small ullage motors are burned to move the SRB's away from the space shuttle. But they only burn for a second and I could not explain why it gets brighter later and for so long. Unless anyone can come up with a better answer I am going to bet the tumbling of the SRB's is primarily responsible for the effect.

P.S. If you look carefully at the end of the photo you can see the space shuttle and SRB's as different lines!

Space Shuttle and SRB's in different tragectories

Space Shuttle and SRB's in different tragectories

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Maps of the Sky

The other day I came across a very awesome graph of the entire universe. It shows more-or-less every object in space we know about on a logarithmic scale from the center of the earth to the edge of the visible universe. It got me thinking about what you can do with large datasets so I decided to play around a little with the tycho-2 catalog. This is a famous catalog in the astronomy world. It contains the position and brightness and some other information of more than 2.5 million stars. That's about 99% of all the stars brighter than 11th magnitude (about 100 times fainter than what you can see with the naked eye!).

I used processing.org as my programming language and wrote a short piece of code to parse through the giant 2,539,913 line datafile and draw a pixel for every star with the brightness of the pixel based on the brightness of the star. And it looked pretty cool. But there was more work to be done. I wanted to use the color information in the catalog to make a color picture of the sky. This is not as straightforward as it might seem. The tycho-2 catalog has the relative brightness of each star measured using a standard blue filter (B) and a standard green filter (V — for historical reasons). Somehow I had to turn that into a color for a computer screen. Luckily a lot of the hard work has been done for me! I found a person who had already worked out screen colors for stars! All I had to do was write a function to approximate a screen color for a given color index (B-V). Sure made that sound easy didn't I?

Color Index

Color Index

Now I can map the sky with all the stars and their color and brightness. It looks something like this:

A map of the sky from the tycho-2 catalog.

A map of the sky from the tycho-2 catalog.

The bright snake-y thing is the milky way. Since we are in the middle of a galaxy when we look through the plane of galaxy we see most of the other stars in that same plane. Think about standing in the middle of a giant disk of dust, if you look straight up you see out of the disk and through a small amount of dust, but if you look right into the disk you see all the dust in a thick cloud. This is the milky way. The dark patches are clouds of gas thick enough to obscure the stars behind them.

The reason it looks like a curve in this picture is because I printed it in equatorial coordinates. These are sky coordinates based on the earth. The middle of the image is directly overhead the equator and the top and bottom are the North and South poles respectively. The milky way is a straight line in the sky, but if you unwrap a spherical map to rectangular coordinates you get all kind of distortion. As an alternative I can also make a map in galactic coordinates. These are coordinates locked to the milky way itself and looks like this:

Map of the sky in calactic coordinates.

Map of the sky in galactic coordinates.

I'm not sure what to do with these pictures but I am surprised how easy it was to make. I am thinking of other large datasets that might be interesting to play with. Any suggestions?

Here are the full size images and the code I used to make them:

If you would like to use the images feel free (this site is published under Creative Commons), drop me a line if you use them for something cool!

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