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In 2000, astronomers studying the A2104 galaxy cluster (in blue) discovered powerful x-rays emanating from several black holes in regions previously thought too old and devoid of gas to create such radiation. They had expected to find perhaps one such x-ray source in the area, but instead found six. The discovery, made using the Chandra X-ray Observatory, changed many of the assumptions scientists had made about the life cycles of galaxies and black holes.
Photograph courtesy NASA/CXC/OCIW/P. Martini et al.
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INSTRUCTIONS FOR DOWNLOADING WALLPAPER
For Windows 95 or Higher
- Determine which size is appropriate for your monitor.
- Click the size you wish to download. (See the top of this page.)
- After the image appears in your browser, click the right-hand button on your mouse.
- On the menu that pops up, select SET AS WALLPAPER or SET AS BACKGROUND.
For Mac OS X
- Determine which image size is appropriate for your monitor.
- Click the size you wish to download. (See the top of this page.)
- After it appears in your browser, drag the image onto your desktop.
- From the Apple menu select SYSTEM PREFERENCES.
- Select DESKTOP.
- In the pull-down menu marked "Collection," select CHOOSE FOLDER.
- Locate desired image file and double-click it.
INSTRUCTIONS FOR DELETING WALLPAPER
For Windows Users (Internet Explorer)
- From your desktop, click the "My Computer" icon.
- Once the window opens, click the following folders, in this order: Local Disk (usually C: drive)
• Documents and Settings
• Your Username
• Application Data
• Microsoft
• Internet Explorer
- In the "Internet Explorer" folder, you will find a file called "Internet Explorer Wallpaper.bmp."
- To delete this file, click the file name with your mouse, then right-click and scroll down the menu to the "delete" option. Or simply hit the "delete" key on your keyboard.
- The wallpaper image will remain until the computer is restarted. To delete from view without restarting the computer, right-click anywhere on an open area of the desktop, scroll down and select "Properties." (This will open the "Display Properties" window.) Click on the "Desktop" tab, select a different background and click "OK." This will change your desktop background immediately.
For Mac OS X
- Locate the "Applications" folder in the Macintosh hard drive and choose "System Preferences."
- Select "Desktop & Screen Saver." This will show you what wallpaper is currently displayed on your desktop.
- To change the current photo, select a new photo from the drop-down menu.
- To remove the photo permanently from the desktop, locate the photo on the hard drive and drag it to the trash. This will delete the image.
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