Agriculture
Treating peanut allergy bit by bit
Making the most of a meal
Springing forward
Amphibians
Newts
Frogs and Toads
Tree Frogs
Animals
A Meal Plan for Birds
Little Bee Brains That Could
Jay Watch
Behavior
A Recipe for Happiness
Pollution at the ends of the Earth
Puberty gone wild
Birds
Albatrosses
Songbirds
Kookaburras
Chemistry and Materials
The chemistry of sleeplessness
Lighting goes digital
Hitting the redo button on evolution
Computers
Hubble trouble doubled
Small but WISE
A Classroom of the Mind
Dinosaurs and Fossils
Dino Babies
Hunting by Sucking, Long Ago
Battling Mastodons
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
Earth
Ancient Heights
Hints of Life in Ancient Lava
Earth from the inside out
Environment
Will Climate Change Depose Monarchs?
Toxic Cleanups Get a Microbe Boost
A Change in Climate
Finding the Past
Early Maya Writing
Of Lice and Old Clothes
Fakes in the museum
Fish
Manta Rays
Nurse Sharks
Hammerhead Sharks
Food and Nutrition
Yummy bugs
The Essence of Celery
Food for Life
GSAT English Rules
Capitalization Rules
Who vs. That vs. Which
Adjectives and Adverbs
GSAT Exam Preparation Jamaica
10 Common Mistakes When Preparing for the GSAT Math Test
Results of GSAT are in schools this week
How are students placed after passing the GSAT exam
GSAT Exams Jamaica Scholarships
GSAT Scholarship
2014 GSAT Results for Jamaican Kids
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Mathematics
Play for Science
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Monkeys Count
Human Body
Sleeping Soundly for a Longer Life
Smiles Turn Away Colds
Opening a Channel for Tasting Salt
Invertebrates
Moths
Horseshoe Crabs
Oysters
Mammals
Baboons
Sun Bear
African Hippopotamus
Parents
The Surprising Meaning and Benefits of Nursery Rhymes
How children learn
Raise a Lifelong Reader by Reading Aloud
Physics
Invisibility Ring
Echoes of a Stretched Egg
The Pressure of Scuba Diving
Plants
Hungry bug seeks hot meal
Nature's Alphabet
Fast-flying fungal spores
Reptiles
Gila Monsters
Snapping Turtles
Sea Turtles
Space and Astronomy
Chaos Among the Planets
Super Star Cluster in the Neighborhood
Mercury's magnetic twisters
Technology and Engineering
Young Scientists Take Flight
Are Propellers Fin-ished?
Slip Sliming Away
The Parts of Speech
What is a Verb?
Countable and Uncountable Nouns
Adjectives and Adverbs
Transportation
Robots on the Road, Again
Revving Up Green Machines
Robots on a Rocky Road
Weather
The solar system's biggest junkyard
Weekend Weather Really Is Different
A Dire Shortage of Water
Add your Article

Galaxies on the go

Scientists have a mystery of cosmic proportions on their hands. Recently astronomers noticed something strange. It seems that millions of stars are racing at high speeds toward a single spot in the sky. Huge collections of stars, gas and dust are called galaxies. Some galaxies congregate into groups of hundreds or thousands, called galaxy clusters. These clusters can be observed by the X-rays they give off. Scientists are excited about the racing clusters because the cause of their movement can't be explained by any known means. The discovery came about when scientists studied a group of 700 racing clusters. These clusters were carefully mapped in the early 1990s using data collected by an orbiting telescope. The telescope recorded X-rays created by electrons located in the hot core of a galaxy cluster. The researchers then looked at the same 700 clusters on a map of whatís called the cosmic microwave background, or CMB. The CMB is radiation, a form of energy, leftover from the Big Bang. Scientists believe that the Big Bang marks the beginning of the universe, billions of years ago. The CMB provides a picture of how the early universe looked soon after the Big Bang. By comparing information from the CMB to the map of galaxy clusters, scientists could measure the movement of the clusters. This is possible because a clusterís movement causes a change in how bright the CMB appears. As a galaxy cluster moves across the sky, the electrons from its hot core interact with radiation from the CMB. This interaction creates a change in the radiationís frequency, or how often an event occurs in a certain amount of time. Scientists can then measure the frequencies to detect movement. As a galaxy cluster moves toward Earth, the radiation frequency goes up. As a cluster moves away from Earth, the frequency goes down. This shift in the frequencies creates an effect similar to the Doppler effect. The Doppler effect is commonly used to measure the speed of moving objects, such as cars. Scientists can use this method to measure the speed and direction of moving galaxies by looking at changes in the radiation frequencies. What the scientists found surprised them. Though the frequency shifts were small, the clusters were moving across the sky at a high speed ó about 1,000 kilometers per second. Even more surprising, the clusters were all moving in the same direction toward a single point in the sky. Researchers donít know whatís pulling this matter across the sky, but they are calling the source ďdark flow.Ē Whatever it is, scientists say the source likely lies outside the visible universe. That means it canít be detected by ordinary means, such as telescopes. One thing is certain. Dark flow has shown that we donít understand everything we see in the universe and that there are still discoveries to be made.

Galaxies on the go
Galaxies on the go








Designed and Powered by HBJamaica.com™