WorldWide Telescope viewing a Hubble image of the Whirlpool Galaxy (M51).
|Original author(s)||Curtis Wong, Jonathan Fay|
|Developer(s)||Microsoft Research, Microsoft Corporation|
|Initial release||February 27, 2008|
|Preview release||Layerscape Beta: (188.8.131.52) / March 26, 2012|
|Written in||C#, .NET|
|Operating system||Microsoft Windows (Windows Client), Mac OS X (Intel-based) (Web Client)|
|Available in||English, Chinese, Spanish, German, Russian, Hindi|
The WorldWide Telescope (WWT) is a computer program created by Microsoft that displays the astronomical sky as maps, the 3D Universe, and earth science data. It can also be used to visualise arbitrary or abstract data sets and time series data, using the power of a PC graphics card to render up to a half million data points. WWT was announced at the TED Conference in Monterey, California in February 2008. Users are able to pan around outer space and zoom as far into any one area as the data will allow. Images are taken from the Hubble Space Telescope and approximately ten earth-bound telescopes. It is possible to view the sky in many wavelengths of light. The software utilizes Microsoft's Visual Experience Engine technologies to function. The program runs under either a Microsoft Windows or a web client based on Silverlight. The program is designed to scale from web browser to desktop to large multi-channel full dome digital planetarium.
The WWT project began in 2002, at Microsoft Research and Johns Hopkins University. Database researcher Jim Gray had developed a satellite Earth-images database (Terraserver) and wanted to apply a similar technique to organizing the many disparate astronomical databases of sky images.
As of October 2008, WWT had "1.5 million active users."
WorldWide Telescope has five main modes. These are Sky, Earth, Planets, Panoramas, and Solar System.
Sky mode is the main feature of the software. It allows users to view high quality images of outer space with images from many space and Earth-based telescopes. Each image is shown at its actual position in the sky. There are over 200 full-sky images in spectral bands ranging from radio to gamma. There are also thousands of individual study images of various astronomical objects from space telescopes such as the Hubble Space Telescope, the Spitzer Space Telescope in infrared, the Chandra X-ray Observatory, COBE, WMAP, ROSAT, IRAS, GALEX as well as many other space and ground based telescopes. Sky mode also shows the Sun, Moon, planets, and their moons in their current positions.
Earth mode allows users to view a 3D model of the Earth, similar to NASA World Wind, Microsoft Virtual Earth and Google Earth. The Earth mode has a default data set with near global coverage and resolution down to sub-meter in high-population centers. Unlike most Earth viewers, WorldWide Telescope supports many different map projections including Mercator, Equirectangular and Tessellated Octahedral Adaptive Subdivision Transform (TOAST). There are also map layers for seasonal, night, streets, hybrid and science oriented Moderate-Resolution Imaging Spectroradiometer (MODIS) imagery. The new layer manger can be used to add data visualization on the Earth or other planets.
Planets mode currently allows users to view 3D models of eight celestial bodies: Venus, Mars, Jupiter, the Galilean moons of Jupiter, and our own planet's moon. It also allows users to view a Mandelbrot set.
Solar System 
This mode displays the major solar system objects from the Sun to Pluto, and Jupiter's moons, orbits of all solar system moons, all 550,000+ minor planets all positioned with their correct scale, position and phase. The user can move forward and backward in time at various rates, or type in a time and date for which to view the positions of the planets, and can select viewing location. The program can show the solar system the way it would look from any location at any time between 1 AD and 4000 AD. Using this tool a user can watch an eclipse, occultation, or astronomical alignment, and preview where the best spot might be to observe a future event. In this mode it is possible to zoom away from the Solar System, through the Milky Way, and out into the cosmos to see a hypothetical view of the entire known universe. Other bodies, spacecraft and orbital reference frames can be added and visualized in the Solar System Mode using the layer manager.
Local user content 
WorldWide Telescope was designed as a professional research environment and as such it facilitates viewing of user data. Virtually all of the data types and visualizations in WorldWide Telescope can be run using supplied user data either locally or over the network. Any of the above viewing modes allow the user to browse and load equirectangular, fisheye, or dome master images to be viewed as planet surfaces, sky images or panoramas. Images with Astronomy Visualization Metadata (AVM) can be loaded and registered to their location in the sky. Images without AVM can be shown on the sky but they user must align the images in the sky by moving, scaling and rotating the images until star patterns align. Once the images are aligned they can be saved to collections for later viewing and sharing. The layer manager can be used to add vector or image data to planet surfaces or in orbit.
Layer Manager 
Introduced in the Aphelion release, the Layer Manager allows management of relative reference frames allowing data and images to be places on Earth, the planets, moons, the sky or anywhere else in the universe. Data can be loaded from files, linked live with Microsoft Excel, or pasted in from other applications. Layers support 3D points and Well-known text (WKT) geometry, shape files, 3D models, orbital elements, image layers and more. Time series data can be viewed to see smoothly animated events over time. Reference frames can contain orbital information allowing 3d models or other data to be plotted at their correct location over time.
Use for amateur astronomy 
The program allows the selection of a telescope and camera and can preview the field of view against the sky. Using ASCOM the user can connect a computer-controlled telescope or an astronomical pointing device such as Meade's MySky, and then either control or follow it. The large selection of catalog objects and 1 arc-second-per-pixel imagery allow an astrophotographer to select and plan a photograph and find a suitable guide star using the multi-chip FOV indicator.
WorldWide Telescope contains a multimedia authoring environment that allows users or educators to create tours with a simple slide-based paradigm. The slides can have a begin and end camera position allowing for easy Ken Burns Effects. Pictures, objects and text can be added to the slides, and tours can have both background music and voice-overs with separate volume control. The layer manager can be used in conjunction with a tour to publish user data visualizations with annotations and animation. One of the tours featured was made by a six year old boy, while other tours are made by astrophysicists such as Dr. Alyssa A. Goodman of the Harvard/Smithsonian Center for Astrophysics and Dr. Robert L. Hurt of Caltech/JPL.
Communities are a way of allowing organizations and communities to add their own images, tours, catalogs and research materials to the WorldWide Telescope interface. The concept is similar to subscribing to a RSS feed except the contents are astronomical metadata.
Virtual observatory 
The WorldWide Telescope was designed to be the embodiment of a rich virtual observatory client envisioned by Turing Award winner Jim Gray and JHU astrophysicist and co-principal investigator for the US National Virtual Observatory, Alex Szalay in their paper titled "The WorldWide Telescope". The WorldWide Telescope program makes use of IVOA standards for inter-operating with data providers to provide its image, search and catalog data. Rather than concentrate all data into one database, the WorldWide Telescope sources its data from all over the web and the available content grows as more VO compliant data sources are placed on the web.
Full dome planetarium support 
The WorldWide Telescope Windows client application supports both single and multichannel full-dome video projection allowing it to power full dome digital planetarium systems. It is currently installed in several world-class planetariums where it runs on turn-key planetarium system. It can also be used to create a stand-alone planetarium by using the included tools for calibration, alignment and blending. This allows using consumer DLP projectors to create a projection system with resolution, performance and functionality comparable to high-end turnkey solutions, at a fraction of the cost. The University of Washington Pioneered this approach with the UW Planetarium. WorldWide Telescope can also be used in single channel mode from a laptop using a mirror dome or fisheye projector to display on inflatable domes, or even on user constructed low-cost planetariums for which plans are available on their website.
WorldWide Telescope was praised before its announcement in a post by blogger Robert Scoble, who said the demo had made him cry. He later called it "the most fabulous thing I’ve seen Microsoft do in years."
Dr. Roy Gould of the Harvard-Smithsonian Center for Astrophysics said:
- "The WorldWide Telescope takes the best images from the greatest telescopes on Earth ... and in space ... and assembles them into a seamless, holistic view of the universe. This new resource will change the way we do astronomy ... the way we teach astronomy ... and, most importantly, I think it's going to change the way we see ourselves in the universe,"..."The creators of the WorldWide Telescope have now given us a way to have a dialogue with our universe."
A PC World review of the original beta concluded that WorldWide Telescope "has a few shortcomings" but "is a phenomenal resource for enthusiasts, students, and teachers." It also believed the product to be "far beyond Google's current offerings."
Prior to the cross platform web client release, at least one reviewer regretted the lack of support for non-Windows operating systems, the slow speed at which imagery loads, and the lack of KML support.
- 365: AIGA Annual Design Competitions 29, experience design category 
- I.D. Magazine 2009 Annual Design Review, Best of Category: Interactive 
See also 
- Aladin Sky Atlas
- Digital Universe Atlas
- Google Sky
- Starry Night
- Universe Sandbox
- Scobleizer blog: What made me cry: Microsoft’s World Wide Telescope 2008-02-27
- TED conference
- Article by TechCrunch
- WorldWide Telescope homepage
- WWT Help and Support page.
- "Jim Gray, Alex Szalay, "The World-Wide Telescope, an Archetype for Online Science", MSR-TR-2002-75, June 2002.
- WorldWide Telescope Equinox Release
- The World-Wide Telescope, an Archetype for Online Science
- It's Not Your Grandpa's Planetarium Anymore
- Low cost WorldWide Telescope Planetarium plans
- Scobleizer: Microsoft researchers make me cry 2008-02-14
- Scobleizer: What Made Me Cry 2008-02-27
- WorldWide Telescope FAQ
- PC Magazine Review
- PC Magazine Review, page 4
- Ogle Earth Review
- AIGA Design Archives
- I.D. - Annual Design Review 2009, Best of Category: Interactive
- WorldWide Telescope
- Talk at TED conference
- World Wide Telescope - Microsoft Research Community
- WWT Data Blog
- World Wide Telescope in education