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Page 1234
Click for high-resolution animation
1. Light Beyond the Bulb: Over and Beyond the Rainbow
QuicktimeMPEG Audio Only With closed-captions (at YouTube)

For the millions of years that humans and our ancestors have roamed this planet, we have been familiar with light. While scientists and philosophers have tried to figure out exactly what light is for millennia, it's only been in the past several hundred years or so that we've really started to figure it out.

In 1665, Isaac Newton, then a young scientist at Cambridge University in England, took a glass prism and held it up to a beam of sunlight streaming through the window. He saw the sunlight that passed through the prism spread out into the colors of the rainbow - red, orange, yellow, green, blue and violet. This was a crucial step in beginning to understand some of the properties of light.

Of course, we know today that Newton was experimenting with what we call "visible light." In 1800, William Herschel made a huge step in revealing that there was light outside what humans could see with their eyes with the discovery of infrared light. The prefix "infra" means "below" and "beyond," which makes sense as this type of light falls just outside the red color of visible light. Soon thereafter, Johann Ritter discovered light on the other end of the visible light spectrum and named it "ultraviolet."

The latter half of the 19th century and the early 20th century saw a rapid explosion of discoveries in the field of light, including identifying X-rays, and gamma rays. Important theoretical work by such scientists as James Clerk Maxwell and Albert Einstein helped piece together all of these discoveries and better understand what light is and how it behaves.

Today, light in all its forms is used for countless applications. A vivid example of different types of light being used together is in modern astronomy. While visible light telescopes have been around since Galileo's time in the early 1600's, the last century has seen the development of telescopes in virtually every wavelength known. Telescopes such as NASA's Chandra X-ray Observatory could not be developed until rocket technology advanced far enough because the Earth's atmosphere blocks X-rays from space from reaching our planet's surface. Other types of light, including certain bands of infrared, ultraviolet, and gamma rays, are in the same situation. We are lucky to be in an era where astronomers can combine data from across the electromagnetic spectrum - from both telescopes on the ground and those in space. It's just one of the many ways that light helps us explore and learn about the world we live in and the Universe that surrounds us.
[Runtime: 03:59]
(NASA/CXC/A. Hobart)

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2. Light Beyond the Bulb: Intro to Light
QuicktimeMPEG Audio Only With closed-captions (at YouTube)

The year 2015 has been declared to be the International Year of Light and Light-based Technologies by the United Nations. People around the world are using this year-long celebration, nicknamed IYL 2015, to look at all of the amazing things light can do.

Whether it comes from the Sun, a distant galaxy, or a neon sign around the corner, light is all around us. We use light to communicate, navigate, learn, explore, and much more.

Light comes in many forms. In fact, the light that we see with our eyes, the same light that makes up the colors of the rainbow,

Light is fascinating for many reasons, including the fact that it possesses qualities of both a wave and a particle. We often characterize light and its behavior based on how far apart the crests of its waves are. This is called wavelength. Alternately, light can be viewed as being composed of a stream of particles.

Another aspect of light that is so amazing is how fast it travels. Nothing in the Universe can travel faster than light. In a vacuum, light moves at an astonishing 1.08 billion kilometers per hour. In other units, this translates into 671 million miles per hour. To put this in perspective, this means light could circle around the Earth seven and a half times in just one second.

In upcoming episodes, we will look at different aspects of light. We will explore some of its intriguing properties and how humans have greatly benefited from learning all that we can about light, which goes far beyond the bulb.
[Runtime: 03:24]
(NASA/CXC/A. Hobart)

Click for high-resolution animation
3. Chandra Sketches: Chandra Explained
QuicktimeMPEG Audio Only With closed-captions (at YouTube)

NASA's Chandra X-ray Observatory was launched into space aboard the space shuttle in 1999. Chandra goes around the Earth in an elliptical orbit. This orbit takes Chandra about a third of the way to the moon.

Chandra doesn't look at light that we can see with our eyes. It detects x-rays from the Universe.

What makes X-rays in space? Things that are very hot and energetic, like matter falling into a black hole, or the remains of a star that has exploded, or giant clouds of super-hot gas that surround galaxy clusters.

Astronomers use Chandra to help us better understand how the Universe - and the things in it - work.
[Runtime: 02:38]
(NASA/CXC/April Jubett)

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4. Chandra Sketches: Clara's Launch
QuicktimeMPEG Audio Only With closed-captions (at YouTube)

My mom works for NASA, for a telescope that studies X-rays from space. She told me about how the telescope, called Chandra, was launched into space aboard the Space Shuttle. That shuttle flight had a woman commander named Eileen Collins. There was another woman astronaut, Cady Coleman, who used a robotic arm to put the telescope into space. (I also learned about them in school from my teacher, Mrs. Panciocco!) These women studied Science and Math and do really interesting things.

My mom knows these women, and it is great that I get to learn about them. Maybe I will be a scientist some day. Or an astronaut. Or maybe I could work for NASA like my mom.

By Clara, age 9.
[Runtime: 02:09]
(NASA/CXC/A. Hobart)

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5. Introduction to OpenFITS
QuicktimeMPEG Audio Only With closed-captions (at YouTube)

Hello and welcome to the Chandra X-ray Observatory's first OpenFITS tutorial screencast. I'm Joe DePasquale, Science Imager for Chandra, and today I'd like to introduce you to our OpenFITS tutorials. OpenFITS can be reached from the main Chandra website ( We developed OpenFITS several years ago with the intent of giving you a behind the scenes look at how we create our colorful images of the universe, but also to put the power into your hands to create those images yourself, using raw data and tutorials on how to combine those data to make color images.

We're excited to announce that we've now added multiwavelength data to our OpenFITS collection. Under the multiwavelength data link, you'll see that there are twenty new images; each one has multiple wavelengths of light available in FITS file format. We've removed some of the stumbling blocks towards creating an image like this by providing data that has already been calibrated, intensity scaled, and plate solved, so that all you need to do is combine these data in the image processing platform of your choice and apply color.

Today, I would like to step through our new tutorial on creating a multiwavelength composite image of M101 using GIMP. At the top of the tutorial page, you will see the links to download the data. This is a Great Observatories image combining Chandra X-ray data, with GALEX ultraviolet, Hubble optical and Spitzer infrared. Now I've already downloaded these data, but for yourself, you will need to right click, and "download file as" to save the data. Next, we will bring up GIMP and open the files as layers in a single GIMP document. We do this using "File->Open As Layers", selecting the four FITS files that we've downloaded, and using the default settings for opening a FITS file in GIMP. Now each image has opened as a layer in a single document.

Before we can apply color to this image, we need to first change the "Image Mode" from "Grayscale" to "RGB". Next we need to allow the layers to show through and to do this, we need to change the "Layer Mode" for each layer from "Normal" to "Screen". By doing that to the infrared layer, I'm now allowing the optical layer underneath to show through. We will apply this change to the optical and UV layers as well.

At this point, we've reached step 4 of the tutorial. Now, as I mentioned in the beginning of the tutorial, these images have already been intensity scaled and calibrated so you really do not need to adjust levels unless you decide you want to. For now, we will skip to step 5, adding color. Starting with the infrared layer, we're going to use the tool "Colors->Colorize" to give the infrared layer a nice red color. A "Hue" value of 0, a "Saturation" of 100, and a "Lightness" of -50 will do this for us. Next, we want to give the optical layer a yellowish-green color. A "Hue" value of 65 works well here, and again a "Saturation" of 100 and "Lightness" of -50. The UV layer, we're going to colorize blue: a "Hue" value of 200, "Saturation" of 100 and "Lightness" of -50. And finally, the X-ray layer, we want to colorize as magenta. A Hue value of about 300 works well here.

And there you have it! In under 5 minutes, we've been able to re-create the Chandra press release image of M101: The Great Observatories image. To finish the image off, we can use "Image->Flatten Image" to create a flattened version and then save it out to the format of our choice. Please explore the twenty new images that we've added to our multiwavelength data collection. If you like what you've created, feel free to share your images on our Facebook page. And, thanks for tuning in!
[Runtime: 04:22]
(NASA/CXC/J. DePasquale)

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6. Hour of Code
QuicktimeMPEG Audio Only With closed-captions (at YouTube)

For many us, it's probably hard to imagine living a life without computers and technology. In fact, it's become so much a part of our society that we may not realize how dependent we are on technology.

But who does the work that enables these computers to fit into our daily lives? Who gets to learn how to code? A project called "Hour of Code" as well as Computer Science Education Week is seeking to address that question by increasing access to coding opportunities for elementary, middle and high school students. The Hour of Code project is particularly interested in getting more girls and all students from underrepresented people of color involved in coding.

Here at the Chandra X-ray Center, we have tried to be as active as possible in expanding the pool of students who go into the fields of science, technology, engineering, and math, also known as "STEM." The inclusion of computer science to this list seemed like an excellent idea, so we gladly signed up for the "Hour of Code" project.

The Chandra X-ray Center has joined forces with other members of the astronomical community, including an astronomer at the American Astronomical Society, others at the Smithsonian Astrophysical Observatory, as well as partners at Google's CS First and Pencil Code, to create a project for the "Hour of Code" that combines color, astronomy, and coding.

Working with NASA and other data from exploded stars, to star-forming regions, to the area around black holes, students learn basic coding (for beginners - no experience required) and follow a video tutorial to create a real world application of science, technology and even art.

Kimberly Arcand directs visualizations and other communications projects at the Chandra X-ray Center, and she led Chandra's contribution to the project. She explains why she feels projects like "Hour of Code" are so important.

Here at Chandra, we get to explore the Universe and computers help us do that. I use coding and computers to help tell stories about science, whether that story takes the form of an image of a galaxy, or a 3 dimensional printable model of an exploded star, or a simple program that lets people see a cluster of young stars in different kinds of light.

Computer science allows anyone to create new things and solve problems. Coding isn't just important in astronomy, but all fields of science. I want to help make sure that anyone can feel like coding and computer science is possible for them. Projects such as the "Hour of Code" and "Pencil Code" can help make that a reality.

By enabling students to use real data from NASA's Chandra X-ray Observatory, along with other astronomical data, this project helps show just how integral coding is in the pursuit of learning about our Universe. We hope it's an example of the exciting ways that computer science - from routine tasks in our everyday lives to the extraordinary quest to explore the cosmos - is part of it all.
[Runtime: 03:56]
(NASA/CXC/A. Hobart)

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7. Chandra - 15 Years and Counting
QuicktimeMPEG With closed-captions (at YouTube)

Celebrating 15 years of science with NASA's Chandra X-ray Observatory: Chandra allows scientists from around the world to obtain X-ray images of exotic environments to help understand the structure and evolution of the universe. NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program for NASA's Science Mission Directorate in Washington. The Smithsonian Astrophysical Observatory in Cambridge, Massachusetts, controls Chandra's science and flight operations.
[Runtime: 14:30]

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8. 2013: A Year with the Chandra X-ray Observatory
QuicktimeMPEG With closed-captions (at YouTube)

The Chandra images included in this brief 2013 retrospective are drawn from dozens of images posted to the Chandra web site (from among hundreds of datasets taken) in the past year to show the breadth and depth of research done using Chandra. Luminous, turbulent, young stars, old stars at the end of their evolution, supermassive black holes, clusters of galaxies and more. Explore these results at
[Runtime: 00:53]
(NASA/CXC/A. Hobart)

Click for high-resolution animation
9. Tour of Chandra Archives 2013
QuicktimeMPEG Audio Only With closed-captions (at YouTube)

Every year, October is designated as American Archive Month. While many people may think "archive" means only dusty books and letters, there are, in fact, many other types of important archives. This includes the use of archives for major telescopes and observatories like NASA's Chandra X-ray Observatory.

The Chandra Data Archive plays a central role in the mission by enabling the astronomical community - as well as the general public - access to data collected by the observatory. The primary role of the CDA is to store and distribute data, which the CDA does with the help of powerful search engines. The archive is one of the legacies of the Chandra mission that will serve both the scientific community and the public for decades to come.

To celebrate and support American Archive Month, we have selected images from a group of eight objects in the Chandra archive to be released to the public for the first time. These images - including supernova remnants, stellar nurseries, and galaxies -- represent the observations of thousands of objects that are permanently available to the world thanks to Chandra's archive.
[Runtime: 01:24]
(NASA/CXC/A. Hobart)

Related Chandra Images:

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10. Images from Chandra's Archive
QuicktimeMPEG This collection of images represent the thousands of observations permanently stored and accessible to the world in Chandra's archive. This sample showcases the wide range of objects that Chandra has observed during its 14-year mission, including the remains of exploded stars, cosmic nurseries where stars are born, and galaxies both similar to our Milky Way and those that are much different. In each of these images, the Chandra data are blue or purple and have been combined with those from other wavelengths.
[Runtime: 00:25]
(NASA/CXC/A. Hobart)

Related Chandra Images:

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