Agriculture
New Gene Fights Potato Blight
Chicken Eggs as Drug Factories
Watering the Air
Amphibians
Tree Frogs
Poison Dart Frogs
Salamanders
Animals
Roboroach and Company
Baboons Listen for Who's Tops
Monkey Math
Behavior
Listening to Birdsong
Newly named fish crawls and hops
Why Cats Nap and Whales Snooze
Birds
Lovebirds
Turkeys
Pigeons
Chemistry and Materials
Salt secrets
Sugary Survival Skill
Boosting Fuel Cells
Computers
Look into My Eyes
Supersonic Splash
The hungry blob at the edge of the universe
Dinosaurs and Fossils
Digging Dinos
Early Birds Ready to Rumble
Dino Bite Leaves a Tooth
E Learning Jamaica
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Earth
Rocking the House
Ancient Heights
A Grim Future for Some Killer Whales
Environment
Pumping Up Poison Ivy
Missing Tigers in India
Giant snakes invading North America
Finding the Past
Untangling Human Origins
Watching deep-space fireworks
Early Maya Writing
Fish
Nurse Sharks
Piranha
Sting Ray
Food and Nutrition
Recipe for Health
A Pepper Part that Burns Fat
Food for Life
GSAT English Rules
Problems with Prepositions
Order of Adjectives
Subject and Verb Agreement
GSAT Exam Preparation Jamaica
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
GSAT stars reap scholarship glory
GSAT Exams Jamaica Scholarships
GSAT Exam Preparation
42,000 students will sit for the GSAT Exam in two weeks
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Mathematics
GSAT Mathematics Quiz, Teaching Math, teaching anxiety
Prime Time for Cicadas
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Human Body
Germ Zapper
Don't Eat That Sandwich!
Gut Germs to the Rescue
Invertebrates
Spiders
Praying Mantis
Nautiluses
Mammals
Koalas
Weasels
African Gorillas
Parents
How children learn
What Not to Say to Emerging Readers
Choosing a Preschool: What to Consider
Physics
The Mirror Universe of Antimatter
Hold on to your stars, ladies and gentlemen
Gaining a Swift Lift
Plants
Stalking Plants by Scent
Tracking the Sun Improves Plant Pollen
Sweet, Sticky Science
Reptiles
Pythons
Geckos
Sea Turtles
Space and Astronomy
Planet Hunters Nab Three More
Older Stars, New Age for the Universe
Holes in Martian moon mystery
Technology and Engineering
Searching for Alien Life
A Satellite of Your Own
Shape Shifting
The Parts of Speech
Problems with Prepositions
Adjectives and Adverbs
What is a Preposition?
Transportation
Charged cars that would charge
Middle school science adventures
Troubles with Hubble
Weather
A Change in Climate
Catching Some Rays
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™