- False-Color Image of Earth Highlights Plant Growth
On Aug. 3, 2004, NASA’s Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) spacecraft began a seven-year journey, spiraling through the inner solar system to Mercury. One year after launch, the spacecraft zipped around Earth, getting an orbit correction from Earth’s gravity and getting a chance to test its instruments by observing its home planet. This image is a view of South America and portions of North America and Africa from the Mercury Dual Imaging System’s wide-angle camera aboard MESSENGER. The wide-angle camera records light at eleven different wavelengths, including visible and infrared light. Combining blue, red, and green light results in a true-color image from the observations. The image substitutes infrared light for blue light in the three-band combination. The resulting image is crisper than the natural color version because our atmosphere scatters blue light. Infrared light, however, passes through the atmosphere with relatively little scattering and allows a clearer view. That wavelength substitution makes plants appear red. Why? Plants reflect near-infrared light more strongly than either red or green, and in this band combination, near-infrared is assigned to look red. Apart from getting a clearer image, the substitution reveals more information than natural color. Healthy plants reflect more near-infrared light than stressed plants, so bright red indicates dense, growing foliage. For this reason, biologists and ecologists occasionally use infrared cameras to photograph forests. > Read more: Why is that Forest Red and that Cloud Blue? How to Interpret a False-Color Satellite Image Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington Caption: Holli Riebeek
Category Archives: Humor
It is time to bring forth your inner geek. Feel the power of the force.
Here is an approach for you. WRITTEN BY A 21 YEAR OLD FEMALE. PUT ME IN CHARGE . . . Put me in charge of food stamps. I’d get rid of Lone Star cards; no cash for Ding Dongs or … Continue reading
Time for a Friday funny. This one will take some time to work your way through it but, it is well worth the effort. Rather than link you to it, here is the story for your enjoyment. The following is … Continue reading
Renault had fun with this one.
Ah, a little musical fun to lighten up the day.
Shamelessly lifted from facebook. I am sure that this one has been around the world a few times but it is worth being today’s Friday Funny. MAN RULES AT LAST A GUY HAS TAKEN THE TIME TO WRITE THIS ALL … Continue reading
Getting back into the swing of things for the Friday Funny series. A day late, I bring you a “short” joke.
Let your imagination run wild. Suspend your disbelief, and have a bit of a laugh this morning.