The human brain, which is believed to be able to store up to 10 trillion bytes of information.
Google does not delete imagery it already made available in past years so imagery from 2007, for example, would be available in Google Earth with the Historical imagery option. From the View menu check 'Historical Imagery' option to display a time slider showing available times for imagery.
For past years earth-based satellite imagery in Google Earth you can select 'Historical Imagery' under View menu. This shows a timeline slider from which to select available satellite and aerial imagery from the past. NASA also provides vast archives of satellite imagery much of which are available online such as the NASA Image Gallery
Google Earth makes available older imagery via the 'Historical Imagery' option found in View menu.
In Google Earth select 'Historical Imagery' under View menu. This shows a timeline slider from which to select available satellite and aerial imagery allowing you to travel back in time to see how things looked in the past.As of GE 6.0 there is time indicator in the status bar [lower-left of the map] showing the oldest imagery available.For example, if you're in London then you can jump to 1945 to see WWII imagery.3-D Building layerNote that the 3-D building layer are current buildings and not associated with any particular time period so you may want to turn off this layer otherwise it may not match well with the older imagery.Newer ImagerySometimes there are actually newer imagery available in Historical Imagery due to Google's quality control process such as the newer image having more clouds or other defects making the older image "better".Street ViewStreet View is not yet available in Historical Imagery to see older photographs.
Not yet for Google Earth. Google recently created historical imagery for Street View on Google Maps. If historical imagery is available then a clock and date will be displayed in the upper left of the map.
For past years earth-based satellite imagery in Google Earth you can select 'Historical Imagery' under View menu. This shows a timeline slider from which to select available satellite and aerial imagery from the past. For example, if you're in London then you can jump to 1945 to see WWII imagery. See related link below for details.
Usually several months after imagery is taken before it is available on Google Earth. It takes months of post-processing to incorporate new imagery into the Google Earth database. For that reason you almost never see imagery newer than 6 months old.
Google Maps doesn't allow you to see old imagery but using Google Earth you can enable historical imagery in the View menu and pick the time period in the time slider that appears.However, availability is location-specific so you may find imagery for a given year in one area and not another. Whenever Google updates its imagery typically the older imagery will become available under historical imagery.Historical imagery feature is not yet available for Street View imagery -- only satellite and aerial imagery.
NASA provides vast archives of satellite imagery of earth much of which are available online such as the NASA Image Gallery. Google Maps and Google Earth are great tools to see satellite imagery of earth. In Google Maps remember to change "Map" view to "Satellite" to display the satellite imagery. Google gets its imagery from a number of commercial imagery providers including: DigitalGlobe and GeoEye, which operate a constellation of high-resolution Earth-imaging satellites, mapping aircraft and an international network of ground stations.
Google Maps does not provide the historical imagery view feature that is available in Google Earth. To see past imagery you must use Google Earth. See related details in link below.
Bin Laden's compound in Pakistan has been confirmed and its location has been posted to several Google Earth forums. While Google Earth had imagery for that area from 2005, GeoEye has made available imagery that was taken the very next day (May 2, 2011). Usually imagery takes many months before new imagery comes online.DigitalGlobe has also posted imagery for that area from earlier in 2011. This imagery can be viewed via DigitalGlobe's Flickr account, or by loading a KML file posted at ogle earth. Later that week, Google quickly released high-quality imagery for this area from May 2010. Also, several 3D models of the compound were made available in the Google 3D Warehouse and one was selected in Google Earth - need 3D Buildings layer checked to see it.See related links below.
The aerial, satellite, and Street View imagery in Google Earth is not real-time (or live). But there is also a webcam layer integrated into Google Earth (enabled in Gallery layer) that can show "live" scenes at selected locations.