Earth-Friendly Fabrics
Watering the Air
Making the most of a meal
Frogs and Toads
Salamanders and Newts
Professor Ant
Elephant Mimics
Feeding School for Meerkats
Mind-reading Machine
Girls are cool for school
Listening to Birdsong
Chemistry and Materials
When frog gender flips
The newest superheavy in town
Spinning Clay into Cotton
Small but WISE
The Book of Life
Galaxies far, far, far away
Dinosaurs and Fossils
Dino Takeout for Mammals
Supersight for a Dino King
Hall of Dinos
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
Groundwater and the Water Cycle
A Volcano Wakes Up
Pollution at the ends of the Earth
Fungus Hunt
Plastic Meals for Seals
What is groundwater
Finding the Past
Of Lice and Old Clothes
A Volcano's Deadly Ash
Prehistoric Trips to the Dentist
Electric Ray
Food and Nutrition
Making good, brown fat
Packing Fat
Turning to Sweets, Fats to Calm the Brain
GSAT English Rules
Adjectives and Adverbs
Subject and Verb Agreement
Finding Subjects and Verbs
GSAT Exam Preparation Jamaica
The Annual GSAT Scholarships
2014 GSAT Results for Jamaican Kids
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Exams Jamaica Scholarships
GSAT Scholarship
GSAT Practice Papers | GSAT Mathematics | Maths
2014 GSAT Results for Jamaican Kids
GSAT Mathematics
Monkeys Count
Play for Science
It's a Math World for Animals
Human Body
Remembering Facts and Feelings
Hey batter, wake up!
A Sour Taste in Your Mouth
What Not to Say to Emerging Readers
The Surprising Meaning and Benefits of Nursery Rhymes
Choosing a Preschool: What to Consider
Dreams of Floating in Space
The Pressure of Scuba Diving
The Mirror Universe of Antimatter
Tracking the Sun Improves Plant Pollen
Pumping Up Poison Ivy
Seeds of the Future
Copperhead Snakes
Space and Astronomy
World of Three Suns
Unveiling Titan
A Planet's Slim-Fast Plan
Technology and Engineering
Morphing a Wing to Save Fuel
Model Plane Flies the Atlantic
Roll-Up Computer Monitors to Go
The Parts of Speech
Countable and Uncountable Nouns
Adjectives and Adverbs
Tinkering With the Basic Bike
Reach for the Sky
Revving Up Green Machines
Recipe for a Hurricane
Arctic Melt
A Change in Climate
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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

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