Making the most of a meal
Hungry bug seeks hot meal
Vitamin D-licious Mushrooms
Tree Frogs
Salamanders and Newts
Poison Dart Frogs
Poor Devils
Saving Africa's Wild Dogs
Ants on Stilts
Baby Number Whizzes
The Colorful World of Synesthesia
Listening to Birdsong
Chemistry and Materials
Boosting Fuel Cells
Graphene's superstrength
Big Machine Reveals Small Worlds
The Earth-bound asteroid scientists saw coming
New twists for phantom limbs
Fingerprint Evidence
Dinosaurs and Fossils
Supersight for a Dino King
Hunting by Sucking, Long Ago
The bug that may have killed a dinosaur
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Quick Quake Alerts
Coral Gardens
Arctic Algae Show Climate Change
Spotty Survival
Swimming with Sharks and Stingrays
Pumping Up Poison Ivy
Finding the Past
Your inner Neandertal
A Plankhouse Past
Early Maya Writing
Food and Nutrition
Making good, brown fat
A Pepper Part that Burns Fat
Chocolate Rules
GSAT English Rules
Order of Adjectives
Finding Subjects and Verbs
Whoever vs. Whomever
GSAT Exam Preparation Jamaica
Mastering The GSAT Exam
Ministry of Education Announces 82 GSAT Scholarships for 2010
The Annual GSAT Scholarships
GSAT Exams Jamaica Scholarships
GSAT stars reap scholarship glory
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
GSAT Mathematics
Math of the World
Losing with Heads or Tails
Play for Science
Human Body
Surviving Olympic Heat
Fighting Off Micro-Invader Epidemics
A Long Haul
Giant Clam
Aquatic Animals
African Zebra
How children learn
Raise a Lifelong Reader by Reading Aloud
Children and Media
IceCube Science
Electric Backpack
Echoes of a Stretched Egg
A Change in Leaf Color
Springing forward
Making the most of a meal
Copperhead Snakes
Box Turtles
Space and Astronomy
Supernovas Shed Light on Dark Energy
Catching a Comet's Tail
Witnessing a Rare Venus Eclipse
Technology and Engineering
A Clean Getaway
Beyond Bar Codes
Bionic Bacteria
The Parts of Speech
Adjectives and Adverbs
What is a Preposition?
What is a Verb?
Troubles with Hubble
Flying the Hyper Skies
Middle school science adventures
A Change in Climate
Recipe for a Hurricane
Science loses out when ice caps melt
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™