Protecting Cows—and People—from a Deadly Disease
Got Milk? How?
Chicken Eggs as Drug Factories
Tree Frogs
Salamanders and Newts
Saving Africa's Wild Dogs
Gliders in the Family
Monkeys Count
Puberty gone wild
Listening to Birdsong
Ear pain, weight gain
Carnivorous Birds
Chemistry and Materials
Toxic Dirt + Avian Flu = Science Fair Success
Picture the Smell
Butterfly Wings and Waterproof Coats
Hitting the redo button on evolution
The Book of Life
Look into My Eyes
Dinosaurs and Fossils
Fossil Forests
Mini T. rex
The man who rocked biology to its core
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
Rocking the House
What is groundwater
Less Mixing Can Affect Lake's Ecosystem
Ready, unplug, drive
Catching Some Rays
A Change in Climate
Finding the Past
Stone Age Sole Survivors
A Long Trek to Asia
Salt and Early Civilization
Mako Sharks
Bull Sharks
Food and Nutrition
Eat Out, Eat Smart
A Pepper Part that Burns Fat
Moving Good Fats from Fish to Mice
GSAT English Rules
Whoever vs. Whomever
Subject and Verb Agreement
Capitalization Rules
GSAT Exam Preparation Jamaica
42,000 students will sit for the GSAT Exam in two weeks
March 21-22, 2013: Over 43,000 students will take the GSAT Exam
Mastering The GSAT Exam
GSAT Exams Jamaica Scholarships
42,000 students will sit for the GSAT Exam in two weeks
Access denied - Disabled boy aces GSAT
GSAT stars reap scholarship glory
GSAT Mathematics
Math of the World
Math and our number sense:
Prime Time for Cicadas
Human Body
A New Touch
Flu Patrol
Workouts: Does Stretching Help?
Black Bear
Choosing a Preschool: What to Consider
Children and Media
What Not to Say to Emerging Readers
Einstein's Skateboard
Extra Strings for New Sounds
Thinner Air, Less Splatter
Plants Travel Wind Highways
Cactus Goo for Clean Water
Fungus Hunt
Gila Monsters
Space and Astronomy
Killers from Outer Space
Pluto's New Moons
Dark Galaxy
Technology and Engineering
Young Scientists Take Flight
A Clean Getaway
Machine Copy
The Parts of Speech
Countable and Uncountable Nouns
Problems with Prepositions
Robots on the Road, Again
Morphing a Wing to Save Fuel
Revving Up Green Machines
A Dire Shortage of Water
Antarctica warms, which threatens penguins
In Antarctica watch the heat (and your step)
Add your Article

Older Stars, New Age for the Universe

The universe has been around for an extra long time. Astronomers used to estimate that the oldest stars were about 13 billion years old. New data suggest that these stars are nearly a billion years older than that. For most of its life, a star produces energy and heat by fusing hydrogen to make helium inside its core. Near the end of its life, when its hydrogen supply is running low, the star continues to convert hydrogen into helium but requires the presence of carbon, nitrogen, and oxygen to do so. Two teams of scientists have now used particle accelerators—atom smashers—to mimic the conditions inside stars. By studying high-energy collisions between hydrogen nuclei (protons) and nitrogen nuclei, the researchers could check how quickly nuclear reactions inside a star proceed. Both groups, one at the University of North Carolina at Chapel Hill and the other at the National Institute for Nuclear Physics in Italy, found that the reactions occur only half as fast as had been estimated. Such a slow reaction time allows gravity to shrink a star more than it would if the reaction were faster. As a result, an elderly star looks brighter than it otherwise would. Brightness is supposed to indicate how old a star is. Now that they know how deceptive brightness can be, astronomers have had to revise their estimates of star age. In line with observations from a satellite called the Wilkinson Microwave Anisotropy Probe, the universe now appears to be about 13.7 billion years old, astronomers say. That's quite a lot of time to ponder.—E. Sohn

Older Stars, New Age for the Universe
Older Stars, New Age for the Universe

Designed and Powered by™