photo credit: Fjellanger Widerøe A.S.; image source

Oceanography: Waves

This photo (hi-res image) shows water wave diffraction near the northern coast of Norway. To learn more about wave behavior, check out these video simulations of diffraction (at the bottom of the page). For more on coastal waves, see Oceanography: Waves, especially the sections "Waves entering shallow water" and "Wave reflection."

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PhET Simulations: Lunar Lander

Try your hand at touching down on the moon with PhET Simulations:  Lunar Lander. As you play this game, you'll build an intuitive understanding of Newton's Laws.

If you'd like to watch the Apollo 11 lunar lander blasting off, see this NASA video at Solarviews. To learn more about this mission, visit Apollo 11 at 35.

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image credit: NASA, H. Bond and E. Nelan (STScI), M. Barstow and M. Burleigh (Univ. of Leicester), and J. Holberg (Univ. of Arizona); image source

White Dwarf Stars

This Hubble image (hi-res version) shows the star Sirius and its companion, a collapsed star called a white dwarf. In x-rays, the relative intensities of Sirius and the companion are reversed--see Sirius A and B. For more on white dwarfs, see White Dwarfs & Planetary Nebulas from the Chandra X-ray Observatory and SolStation's Sirius 2.

Astronomy Picture of the Day

Check out these image collections in astronomy and astrophysics:

• The NASA/Smithsonian High Energy Astrophysics Picture of the Week
• NASA's Astronomy Picture of the Day (APOD)
• The Hubble Space Telescope Image Gallery