Agriculture
Got Milk? How?
Earth-Friendly Fabrics
Watering the Air
Amphibians
Salamanders
Bullfrogs
Tree Frogs
Animals
Sea Lilies on the Run
From Chimps to People
Spotting the World's Leggiest Animal
Behavior
Puberty gone wild
From dipping to fishing
Night of the living ants
Birds
Falcons
Robins
Tropical Birds
Chemistry and Materials
Earth from the inside out
Hair Detectives
Heaviest named element is official
Computers
Electronic Paper Turns a Page
Troubles with Hubble
Seen on the Science Fair Scene
Dinosaurs and Fossils
Mini T. rex
Fingerprinting Fossils
Dinosaurs Grow Up
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
Earth
The Rise of Yellowstone
Recipe for a Hurricane
Undersea Vent System Active for Ages
Environment
Inspired by Nature
Lessons from a Lonely Tortoise
An Ocean View's Downside
Finding the Past
Chicken of the Sea
Your inner Neandertal
Preserving Ancient Warrior Paint
Fish
Swordfish
Freshwater Fish
Codfish
Food and Nutrition
Eat Out, Eat Smart
How Super Are Superfruits?
A Pepper Part that Burns Fat
GSAT English Rules
Who vs. Whom
Pronouns
Subject and Verb Agreement
GSAT Exam Preparation Jamaica
42,000 students will sit for the GSAT Exam in two weeks
GSAT Scholarship
10 Common Mistakes When Preparing for the GSAT Math Test
GSAT Exams Jamaica Scholarships
Results of GSAT are in schools this week
2014 GSAT Results for Jamaican Kids
GSAT stars reap scholarship glory
GSAT Mathematics
42,000 students will sit for the GSAT Exam in two weeks
How to Slice a Cake Fairly
GSAT Practice Papers | GSAT Mathematics | Maths
Human Body
From Stem Cell to Any Cell
A Long Trek to Asia
Kids now getting 'adult' disease
Invertebrates
Insects
Sponges
Sea Anemones
Mammals
Boxers
Bulldogs
Walrus
Parents
Raise a Lifelong Reader by Reading Aloud
Expert report highlights the importance to parents of reading to children!
Choosing a Preschool: What to Consider
Physics
The Mirror Universe of Antimatter
Hold on to your stars, ladies and gentlemen
Echoes of a Stretched Egg
Plants
Springing forward
Plants Travel Wind Highways
City Trees Beat Country Trees
Reptiles
Cobras
Snapping Turtles
Reptiles
Space and Astronomy
Cousin Earth
Big Galaxy Swallows Little Galaxy
A Darker, Warmer Red Planet
Technology and Engineering
Sugar Power for Cell Phones
Roll-Up Computer Monitors to Go
Slip Sliming Away
The Parts of Speech
Countable and Uncountable Nouns
What is a Verb?
What is a Preposition?
Transportation
Robots on a Rocky Road
Revving Up Green Machines
Morphing a Wing to Save Fuel
Weather
Antarctica warms, which threatens penguins
The Best Defense Is a Good Snow Fence
Science loses out when ice caps melt
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™