Environments which are dangerous for people, such as deep in the ocean, can be viewed remotely. In these investigations, "robot" arms and eyes can be manipulated from remote sites.
Aquarius is one example of this idea in action.
We many links to astronomy resources, but Hands-On Universe makes special software available for students to manipulate images from telescopes, just as real astronomers do.
Google Sky provides an in-depth look at the universe using the same type of interface as Google Maps.
The Sea Perch is a simple, remotely operated underwater vehicle, or ROV, made from PVC pipe and other inexpensive, easily available materials.
The Sea Perch Program, created by the MIT Sea Grant College Program in 2003, trains educators across the United States and around the world to build the Sea Perch. Teachers then work with students to build their own Sea Perches and deploy them on research missions in nearby bodies of water.
The hands-on Sea Perch experience is a gateway to further study and careers in robotics, engineering, marine sciences and more.
This Acrobat (.pdf) document from the National Air and Space Museum provides a teaching guide and an introduction to Remote Sensing.
Water on the Web offers data about water quality from deep within 4 Minnesota lakes. This approach also represents a new method for visualization of information, especially appropriate for some students.
Infrared detection has now reached secondary schools. CalTech has pioneered this work.
Companies, such as Vernier, offer sensing instruments which are linked to software programs for data analysis and manipulation. These probes for every major subject in science can be used with portable computers so students can take them on field trips easily.
With the addition of hand held devices and low cost sensors, students can truly investigate the real world and conduct on-the-spot data analyses.