Welcome to another edition of Science Saturday. This week: how to use a laser like a tractor beam to pull objects, detect cancer with a very Trek-like smartphone app, look inside the sun to find the missing sunspots, and see the most beautiful, hi-res photo mosaic of the moon ever created. All this and more, plus our gadget of the week: jetpack skiing!
Researchers Design Working Tractor Beam by Teaching a Laser to Pull Rather Than Push
It is well known (to physicists) that light can push an object forward. But, the ability of a forward moving beam of light to pull objects backward is counterintuitive. Researchers have now shown, mathematically at least, that the so-called “backward scattering force” (BSF) is indeed possible. In the recently published article, “Backward Pulling Force from a Forward Propagating Beam“, Jun Chen and his co-authors demonstrate the specific conditions necessary to make a real-life Trek style tractor beam, which could move very tiny objects. The actual device is yet to be constructed, but this new mathematical theory has laid the groundwork for building the real deal. How soon do you think we will be seeing the first real tractor beam?
Side note: This is similar to a story we reported last October, which told of Aussies that have developed a method to move particles in a beam of light. However, they used the same technology that is used in optical tweezers, which use a forward moving beam to exert a forward momentum on an object. This new research can use a forward moving beam to exert a negative momentum on an object (i.e. “pull” an object toward the source of a moving beam of light).
Figure from Chen’s paper demonstrating BSF
Detect Cancer With a Very Trek-Like Smartphone App
Detecting cancer? There’s an app for that. A palm-sized MRI machine, powered by a smartphone app, may revolutionize cancer detection. Just as with large-scale MRI’s, this new gadget uses magnetic fields to “line up” molecules in tissue and sends a radio pulse through them. How the molecules respond to this pulse tells the doctor what they are made of. This handheld device measures the levels of specific proteins in a person’s tissue, the presence of which can indicate a cancerous tumor. In a trail of 50 patients, researchers saw a 96% success rate for detecting cancer. The pseudo medical tricorder is not quite ready for prime time just yet, but authors of the recent research say that the new technique, “shows potential for cancer diagnosis in the clinic.”
Read the full article in Science.
Medical Tricorder-like device detects cancer 96% successfully
Mystery of the Missing Sunspots
Research being published in the March 3rd edition of Nature may explain why sunspots disappeared for almost two years beginning in 2008-09. Fluctuations in solar activity are expected, but the recent solar minimum was “the deepest in a century” and longer than predicted. As solar activity reached 100-year lows, Earth’s upper atmosphere cooled, the sun’s magnetic field weakened, and cosmic rays were able to penetrate the Solar System in record numbers. Scientists now think that plasma currents deep inside the sun interfered with the formation of sunspots causing these Earth-felt effects. These conclusions are based on a new computer model of the sun’s interior. “Understanding and predicting solar minimum is something we’ve never been able to do before — and it turns out to be very important,” says Lika Guhathakurta of NASA’s Heliophysics Division. During minima and maxima, strange things happen that may affect Earth in ways we cannot yet predict. This new computer model should help us to forecast better the behavior of our sun.
More at Science@NASA.
A blank sun during the extended solar minimum
Highest Ever Resolution Photo Mosaic of the Moon
Using data from the Lunar Reconnaissance Orbiter Camera (LROC), Arizona State University scientists have compiled one of the highest resolution mosaics of the lunar nearside ever produced. You really must click on the image below to see a larger version of the file in order to really appreciate the beauty of the image. Phil Plait of Bad Astronomy explains why this new mosaic is so awesome:
“I’ve spent a lot of time at the eyepiece looking at the Moon, but I’ve never seen it like this. The detail is amazing, and the shadowing provides a sense of depth you just can’t get when observing the full Moon from home. It’s beautiful.”
The mosaic is made up of about 1300 separate images taken by LROC’s Wide-Angle Camera. The size of the full resolution image is an astounding 24,000 x 24,000 pixels, with the resolution of about 145 meters/pixel. The full size 550 Mb TIF file is available on ASU’s website, but you can also get a more palatable 1400 x 1400 pixel PNG file with labels, too. (via Arizona Geology)
Pic(s) of the Week: Space Shuttle Discovery Lift Off
These amazing shots were taken upon lift off of space shuttle Discovery carrying the crew of STS-133 (and Robonaut2). The bright blue cone-shaped features coming from Discovery’s engines, which are visible in both photos, but primarily the first, are known as “shock diamonds“.
Video of the Week: A Future Made of Glass
Tweeted by @Roddenberry last week, this video by Corning glass company demonstrates what the future could look like, utilizing the capabilities of glass technologies to their full abilities. Get ready for a magical future!
Gadget of the Week: Jetpack Skiing!
Okay, so not so much a gadget of its own, but a new and exciting use for existing tech. Troy Harman, stuntman and extreme sports junkie, has repurposed a decommissioned military UAV into a ski jetpack. With the jetpack strapped to his back and his boots clipped into his skis, Troy gets speeds of up to 47-mph going uphill at just half throttle! Who needs an expensive lift ticket when you can speed UP the black diamond slopes with a ski jetpack, no waiting! Check out Troy’s video below of the jetpack in action.
Not enough science for you? Here’s a warp-speed look at some more science tid-bits that are worth a peek.
- The crew aboard Space Shuttle Discovery’s STS-133 mission will get a Star Trek wake-up call this Monday at 8:23 AM GMT in addition to the surprise TOS Trek-themed wake up call this last Friday
- Timmy, the ThinkGeek geek monkey visits Fermilab
- The mysterious rumble of thundersnow