Washington Square Park of New York City was transformed into a "science wonderland" on Sunday, June 14, 2009 when the World Science Festival Youth and Family Street Fair returned for its second year.

A new image from NASA's Chandra X-ray Observatory shows a supernova remnant with a different look. This object, known as SNR 0104-72.3 (SNR 0104 for short), is in the Small Magellanic Cloud, a small neighboring galaxy to the Milky Way. Astronomers think that SNR 0104 is the remains of a so-called Type Ia supernova caused by the thermonuclear explosion of a white dwarf.

Martin Elvis is a senior astrophysicist at the Smithsonian Astrophysical Observatory. When not getting bumped up to business class, he studies quasars and other fascinating phenomena in the Universe with Chandra and other telescopes.

Copyright: Smithsonian Institution, from SI Research Reports

One of Chandra's most iconic images is that of the center of our Galaxy. We should say, more accurately, that this image is just a small piece of Milky Way's center. This image - which stretches some 900 light years in one direction and 400 light years in the other - is actually a montage of 30 separate Chandra images that have been stitched together to create this stunning X-ray tableau. Even with all of that data, this image still only represents a small fraction of the plane of the Milky Way, which stretches some 100,000 light years across (again, compared to just 900 light years in our image.) But even in that relatively small space, we see how amazing our Galaxy is. There's a supermassive black hole and hundreds of other objects, including neutron stars, smaller black holes, stars and more.

But when do we get a full picture of the Milky Way? The answer is we don't. Since our Solar System is embedded within our Galaxy, we never get a real astronomical image of what it looks from the outside as produced by a telescope. (What we see when we are "looking" at a complete picture of the Milky Way is an artist's representation - or another spiral galaxy that is standing in as its stunt double.)

This is a composite image showing a small region of the Chandra Deep Field North. Shown in blue is a deep image from the Chandra X-ray Observatory and in red is an image from the Multi-Element Radio Linked Interferometer Network (MERLIN) an array of radio telescopes based in Great Britain. An optical image from the Sloan Digital Sky Survey (SDSS) is shown in white, yellow and orange.

Imagine getting a picture of some random patch of the Earth. This picture has some features on it - maybe a mountain or a river or even a city - but from the altitude it was taken, you can't be exactly sure what's what. And then imagine if someone asked you to place it exactly where it should lie on the Earth. Really hard, right?

It's New Hampshire - USA

Well, of course, it gets a lot easier if someone were to give you the exact longitude and latitude. While this seems like an obvious thing to do, it's not so simple for astronomical images. When astronomers create their images for scientific purposes, these images retain certain coordinate information - like longitude and latitude - but for space. Unfortunately, when these images get processed further to make them attractive for the public, this information gets stripped out. In other words, we're back to having no clue where this image matches up with anything else.

Many of this week's blogs focused on that little-known telescope that's being invaded by a spaceship. In case you missed it, the telescope is called "Hubble" and the spaceship is our Space Shuttle Atlantis. Naturally, the astro-blogosphere took notice. In his "Dynamic of Cats" blog, Steinn Sigurdsson talks about the last pretty picture to come out of that workhorse instrument with the stubborn screw -- Wide Field/Planetary Camera 2.

Take a look at "The Bigger Picture," a blog produced by the Smithsonian Photography Initiative (SPI). It aims to present an inside look at the Smithsonian's photography collections and invites audiences to engage in an online discussion about photography's powerful impact on our world. We contributed a post on "Seeing the Invisible (part I)" that you might enjoy: http://blog.photography.si.edu/2009/05/11/seeing-the-invisible/

-Kim Arcand, CXC

Activity from a supermassive black hole is responsible for the intriguing appearance of this galaxy, 3C305, located about 600 million light years away from Earth. The structures in red and light blue are X-ray and optical images from the Chandra X-ray Observatory and Hubble Space Telescope respectively. The optical data is from oxygen emission only, and therefore the full extent of the galaxy is not seen.

This week, the Space Shuttle Atlantis will return to the Hubble Space Telescope for a fifth and final time. The mission will bring the telescope new instruments, batteries, and gyroscopes that will extend its lifetime for hopefully several years or more.