Agriculture
Middle school science adventures
Watering the Air
Flush-Free Fertilizer
Amphibians
Frogs and Toads
Salamanders
Tree Frogs
Animals
No Fair: Monkey Sees, Doesn't
New Mammals
Firefly Delight
Behavior
Lightening Your Mood
Fear Matters
Nice Chimps
Birds
Owls
Emus
Blue Jays
Chemistry and Materials
A New Basketball Gets Slick
Butterfly Wings and Waterproof Coats
Supergoo to the rescue
Computers
The Earth-bound asteroid scientists saw coming
Electronic Paper Turns a Page
New eyes to scan the skies
Dinosaurs and Fossils
Digging for Ancient DNA
A Really Big (but Extinct) Rodent
Dinosaur Dig
E Learning Jamaica
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Recipe for a Hurricane
Killer Space Rock Snuffed Out Ancient Life
Riding to Earth's Core
Environment
Animal CSI or from Science Lab to Crime Lab
A Stormy History
Will Climate Change Depose Monarchs?
Finding the Past
Your inner Neandertal
Sahara Cemetery
Big Woman of the Distant Past
Fish
Seahorses
Pygmy Sharks
Bull Sharks
Food and Nutrition
The Essence of Celery
In Search of the Perfect French Fry
A Taste for Cheese
GSAT English Rules
Finding Subjects and Verbs
Adjectives and Adverbs
Who vs. That vs. Which
GSAT Exam Preparation Jamaica
How are students placed after passing the GSAT exam
GSAT Practice Papers | GSAT Mathematics | Maths
2014 GSAT Results for Jamaican Kids
GSAT Exams Jamaica Scholarships
42,000 students will sit for the GSAT Exam in two weeks
2014 GSAT Results for Jamaican Kids
GSAT stars reap scholarship glory
GSAT Mathematics
How a Venus Flytrap Snaps Shut
Secrets of an Ancient Computer
Math and our number sense: PassGSAT.com
Human Body
Attacking Asthma
A New Touch
Heart Revival
Invertebrates
Crustaceans
Giant Clam
Cockroaches
Mammals
Rats
Doberman Pinschers
Oxen
Parents
What Not to Say to Emerging Readers
How children learn
Raise a Lifelong Reader by Reading Aloud
Physics
Strange Universe: The Stuff of Darkness
Electric Backpack
The Mirror Universe of Antimatter
Plants
Stalking Plants by Scent
Springing forward
Assembling the Tree of Life
Reptiles
Geckos
Rattlesnakes
Snapping Turtles
Space and Astronomy
Baby Star
Icy Red Planet
A Star's Belt of Dust and Rocks
Technology and Engineering
A Micro-Dose of Your Own Medicine
A Clean Getaway
Beyond Bar Codes
The Parts of Speech
Countable and Uncountable Nouns
Problems with Prepositions
What is a Verb?
Transportation
Flying the Hyper Skies
Robots on a Rocky Road
How to Fly Like a Bat
Weather
Where rivers run uphill
Watering the Air
The solar system's biggest junkyard
Add your Article

Solving a Sedna Mystery

Orbiting beyond Pluto, a planetoid called Sedna has aroused plenty of curiosity—and created some confusion—since its discovery last year. It's the most-remote object known in the solar system. Astronomers have been especially frustrated by their inability to find a moon around the distant object. The first observations had suggested that there ought to be one. These observations appeared to show that Sedna spins very slowly, just once every 20 days. Only the tug of a little moon could explain this lazy spin rate. Images taken by the Hubble Space Telescope, however, failed to turn up a moon. Now, researchers from the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., say they have solved the puzzle. New measurements show that Sedna doesn't spin so slowly after all. Using a highly sensitive telescope on Mount Hopkins in Arizona, the astronomers measured periods of brightness and darkness on Sedna. The results showed that the planetoid spins some 50 times faster than previous estimates had suggested. Elsewhere, researchers turned up other interesting news about Sedna. Contrary to earlier assumptions, they found that Sedna doesn't appear to have any ice on its surface. That's strange because it's very cold so far away from the sun. And Pluto, which is closer to the sun, has lots of ice on it. So does Pluto's moon, Charon. The explanation for this mystery, the scientists suggest, is that Sedna used to have an icy surface. However, constant bombardment by cosmic rays and the sun's ultraviolet light produced a dark coating instead. Because Pluto and Charon orbit closer to the sun than Sedna, they might encounter more debris than Sedna does. Frequent collisions with this debris could then either prevent a dark coating from forming or deliver fresh ice to their surfaces.—E. Sohn

Solving a Sedna Mystery
Solving a Sedna Mystery








Designed and Powered by HBJamaica.com™