Springing forward
Seeds of the Future
Getting the dirt on carbon
Tree Frogs
Poison Dart Frogs
Insect Stowaways
Ants on Stilts
The Secret Lives of Grizzlies
The Smell of Trust
Video Game Violence
Pipefish power from mom
Chemistry and Materials
Music of the Future
The Buzz about Caffeine
Screaming for Ice Cream
A Light Delay
Play for Science
Fingerprint Evidence
Dinosaurs and Fossils
A Dino King's Ancestor
South America's sticky tar pits
Have shell, will travel
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
A Grim Future for Some Killer Whales
On the Trail of America's Next Top Scientists
Giving Sharks Safe Homes
Sounds and Silence
A Change in Climate
City Trees Beat Country Trees
Finding the Past
Decoding a Beverage Jar
Big Woman of the Distant Past
Settling the Americas
Great White Shark
Food and Nutrition
Healing Honey
In Search of the Perfect French Fry
Chocolate Rules
GSAT English Rules
Subject and Verb Agreement
Problems with Prepositions
Capitalization Rules
GSAT Exam Preparation Jamaica
March 21-22, 2013: Over 43,000 students will take the GSAT Exam
Tarrant High overcoming the odds
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
GSAT Exams Jamaica Scholarships
Access denied - Disabled boy aces GSAT
2014 GSAT Results for Jamaican Kids
GSAT Scholarship
GSAT Mathematics
How to Slice a Cake Fairly
Math is a real brain bender
Play for Science
Human Body
A Long Haul
Germ Zapper
The tell-tale bacteria
The Surprising Meaning and Benefits of Nursery Rhymes
Raise a Lifelong Reader by Reading Aloud
How children learn
Invisibility Ring
Strange Universe: The Stuff of Darkness
The Mirror Universe of Antimatter
A Change in Leaf Color
Fastest Plant on Earth
White fuzzy mold not as friendly as it looks
Komodo Dragons
Space and Astronomy
Big Galaxy Swallows Little Galaxy
Super Star Cluster in the Neighborhood
Cool as a Jupiter
Technology and Engineering
Beyond Bar Codes
A Light Delay
Smart Windows
The Parts of Speech
Adjectives and Adverbs
Countable and Uncountable Nouns
Problems with Prepositions
Middle school science adventures
Revving Up Green Machines
Where rivers run uphill
Science loses out when ice caps melt
Catching Some Rays
Polar Ice Feels the Heat
Add your Article

Slip-sliding away

Spin around quickly for a long period of time, and you’re likely to lose your balance and fall. Strangely, a similar thing can occur with orbiting bodies such as a planet. Spinning on its axis for millions of years, a planet’s surface features can shift position over time, upsetting its balance. If a major shift occurs, the planet might even tilt over. Now, scientists say such a shift actually happened on Jupiter’s large icy moon Europa. Recent images taken from three different spacecraft — Voyager, Galileo and New Horizons — provide the clues. The images show three deep troughs curving hundreds of miles across the moon’s surface. Researchers analyzed the size, shape and location of the troughs and compared them to models. The study suggests that the depressions were formed when Europa’s thick, icy surface slid a whopping 80 degrees — nearly a quarter-turn. What would trigger such a massive maneuver? A heavy buildup of ice at the poles might do it, scientists say. A spinning body, such as a planet, is most stable when its mass is farthest from its spin axis, or axis of rotation. A concentration of heavy polar ice could have knocked Europa off kilter, moving the polar regions toward the equator. This strange phenomenon, called "true polar wander,” would normally take millions of years to play out. But evidence suggests Europa’s icy shell may have migrated over just a few decades. Why? Scientists believe Europa’s heavy ice shell floats on top of a hidden ocean. The sliding of the moon’s surface provides further evidence for this notion. After all, moving 300,000 trillion metric tons of surface weight nearly 90 degrees would be very difficult unless it was floating on water, scientists say. The study provides another intriguing idea: If an ocean lies beneath the moon's icy surface, it just might harbor life. Power Words Axis An imaginary straight line around which an object turns. For a rotating sphere, such as the Earth, the two ends of the axis are called poles. Europa One of Jupiter’s moons Planet An object in outer space that moves around a star, such as the Sun, and that is larger than an asteroid. A planet does not produe its own light but shines because it reflects the light of the star that it moves around.

Slip-sliding away
Slip-sliding away

Designed and Powered by™