This patient education program explains bone densitometry and its importance in treating and preventing osteoporosis. This is a MedlinePlus Interactive Health Tutorial from the National Library of Medicine, designed and developed by the Patient Education Institute.

This tutorial on crystallography is broken down into equipment set-up, x-ray diffraction basics, symmetry and space groups, structure factors and phase problems, phasing techniques, model building, and real space correlation plots. Diagrams and interactive topics accompany the text, along with an interactive applet on Bragg's Law.

Students explore the evidence for dark matter using the measurements made by the ROSAT X-ray satellite for a small group of galaxies. Grades 9-12.

An animation of an M-class flare viewed by the RHESSI instrument on February 20, 2002. On tape, this version plays at the maximum speed of one frame corresponding to 3.5 seconds of data collection time. The flare was located at -17.8 degrees South, 9.8 degrees West (heliographic coordinates) in NOAA active region number 9830.

An animation of an M-class flare viewed by the RHESSI instrument on February 20, 2002. On tape, this version plays at a speed of four video frames corresponding to 3.75 seconds of data collection time. The flare was located at -17.8 degrees South, 9.8 degrees West (heliographic coordinates) in NOAA active region number 9830.

An animation of an M-class flare viewed by the RHESSI instrument on February 20, 2002. On tape, this version plays at a speed of two video frames corresponding to 3.5 seconds of data collection time. The flare was located at -17.8 degrees South, 9.8 degrees West (heliographic coordinates) in NOAA active region number 9830.

The Solar X-ray Imager (SXI) aboard GOES-12 went online for full-time operation on January 22, 2003. It provides full-disk X-ray images of the Sun updated every few minutes. This movie combines three channels from the imager with red covering 0.6-2.0 nanometers wavelength, green covering 0.6-4.0 nanometers wavelength, and blue covering ~0.6-6.0 nanometers wavelength.

X-rays, CT scans and MRI scans are all medical imaging techniques of great practical importance that have been encountered by a great many people in their medical histories. This unit illustrates how these techniques work – and their limitations and advantages.

This film examines the process of radioactive decay as part of an educational unit on the health effects of ionizing radiation (radioactivity). Educational concepts include radioisotope, radioactive decay, alpha radiation, beta radiation, gamma radiation, x-radiation, decay chain, and half-life. This instructional film is from Kansas State University's web-based course, GENAG 711, Occupational and Agricultural Health. Copyright 2011, Mitch Ricketts.

This film explores the health effects of ionizing radiation (radioactivity). The film also examines methods for reducing exposures to radiation in workplaces. Educational concepts include ionizing radiation, radiation sickness, radiation burns, other health effects, ion pairs, free radicals, penetration versus interaction, and time/distance/shielding. This instructional film is from Kansas State University's web-based course, GENAG 711, Occupational and Agricultural Health. Copyright 2011, Mitch Ricketts

Here's a view of the Sun, from the point of view of a fleet of Sun-observing spacecraft - SOHO, TRACE, and RHESSI. The time scales of the data samples in this visualization range from 6 hours to as short as 12 seconds and the display rate varies throughout the movie. The region and event of interest is the solar flare over solar active region AR9906 on April 21, 2002. In this visualization, the instrument names appear in a color roughly matching the color used for the data, and black corresponds to no (current) instrument coverage.

This educational brief provides an overview of how previously unrevealed information about our galaxy and other celestial objects can be obtained by examining their energy emissions in parts of the electromagnetic spectrum other than that visible to the human eye. Remote imagery of the Milky way in several wavelengths is included, and links to additional information are embedded in the text.

Parallel treatments of photons, electrons, phonons, and molecules as energy carriers, aiming at a fundamental understanding of descriptive tools for energy and heat transport processes from nanoscale to macroscale. Topics include the energy levels, the statistical behavior and internal energy, energy transport in the forms of waves and particles, scattering and heat generation processes, Boltzmann equation and derivation of classical laws, deviation from classical laws at nanoscale and their appropriate descriptions, with applications in nanotechnology and microtechnology.

On May 11, 1999, the solar wind that blows constantly from the Sun virtually disappeared. Dropping to a small fraction of its normal density and to half its normal speed, the solar wind died down enough to allow physicists to observe particles flowing directly from the Suns corona to Earth. This severe change in the solar wind also drastically changed the shape of Earths magnetic field and produced a rare auroral display at Earths North Pole.

On May 11, 1999, the solar wind that blows constantly from the Sun virtually disappeared. Dropping to a small fraction of its normal density and to half its normal speed, the solar wind died down enough to allow physicists to observe particles flowing directly from the Suns corona to Earth. This severe change in the solar wind also drastically changed the shape of Earths magnetic field and produced a rare auroral display at Earths North Pole.

The solar flare at Active Region 10039 on July 23, 2002 exhibits many exceptional high-energy phenomena including the 2.223 MeV neutron capture line and the 511 keV electron-positron (antimatter) annihilation line. In the animation, the RHESSI low-energy channels (12-25 keV) are represented in red and appears predominantly in coronal loops. The high-energy flux appears as blue at the footpoints of the coronal loops. Violet is used to indicate the location and relative intensity of the 2.2MeV emission.

Close-up view of the solar active region AR9906 on April 21, 2002 with TRACE and RHESSI data. RHESSI observes x-rays from this flare. The red contours represent the 12-25 keV photon energy range and the blue contours represent 50-100 keV.

Zoom in (with rotation) to solar active region AR9906 on April 21, 2002 with SOHO-EIT,TRACE and RHESSI data. RHESSI observes x-rays from this flare. The red contours represent the 12-25 keV photon energy range and the blue contours represent 50-100 keV.

Zoom in to solar active region AR9906 on April 21, 2002 with SOHO-EIT, TRACE and RHESSI data. RHESSI observes x-rays from this flare. The red contours represent the 12-25 keV photon energy range and the blue contours represent 50-100 keV.