Keeping Bugs Away from Food
Growing Healthier Tomato Plants
Silkís superpowers
Frogs and Toads
Poison Dart Frogs
Tree Frogs
No Fair: Monkey Sees, Doesn't
A Microbe Nanny for Young Wasps
Awake at Night
Supersonic Splash
Puberty gone wild
How Much Babies Know
Tropical Birds
Chemistry and Materials
The hungry blob at the edge of the universe
Sticking Around with Gecko Tape
Fog Buster
Small but WISE
Music of the Future
A Light Delay
Dinosaurs and Fossils
Winged Insects May Go Way Back
Dinosaur Eggs-citement
Early Birds Ready to Rumble
E Learning Jamaica
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Ice Age Melting and Rising Seas
Watering the Air
Meteorites may have sparked life on Earth
Snow Traps
Shrimpy Invaders
Improving the Camel
Finding the Past
A Human Migration Fueled by Dung?
Decoding a Beverage Jar
Digging Up Stone Age Art
Bull Sharks
Hammerhead Sharks
Food and Nutrition
Turning to Sweets, Fats to Calm the Brain
Strong Bones for Life
The mercury in that tuna
GSAT English Rules
Problems with Prepositions
Capitalization Rules
Subject and Verb Agreement
GSAT Exam Preparation Jamaica
GSAT Exam Preparation
GSAT Practice Papers | GSAT Mathematics | Maths
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
GSAT Exams Jamaica Scholarships
Access denied - Disabled boy aces GSAT
Results of GSAT are in schools this week
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Mathematics
Monkeys Count
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
How a Venus Flytrap Snaps Shut
Human Body
Cell Phone Tattlers
Speedy Gene Gives Runners a Boost
Kids now getting 'adult' disease
Vampire Bats
Raise a Lifelong Reader by Reading Aloud
What Not to Say to Emerging Readers
The Surprising Meaning and Benefits of Nursery Rhymes
Einstein's Skateboard
Spin, Splat, and Scramble
Echoes of a Stretched Egg
Stalking Plants by Scent
Farms sprout in cities
When Fungi and Algae Marry
Space and Astronomy
Rover Makes Splash on Mars
A Whole Lot of Nothing
A Family in Space
Technology and Engineering
Weaving with Light
Dancing with Robots
Reach for the Sky
The Parts of Speech
Countable and Uncountable Nouns
Problems with Prepositions
Morphing a Wing to Save Fuel
Middle school science adventures
Tinkering With the Basic Bike
A Dire Shortage of Water
In Antarctica watch the heat (and your step)
Catching Some Rays
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™