MondaySeptember 10,

2012(The First Galaxies;

Videos HTUW: The Big Bang, Parts 6 & 7)

The Launch PadMonday, 9/10/12

Respond to the following statements with either true or false:

Blue wavelength is shorter than red wavelength.

trueWhen a light source is moving away,

the light appears redder than it actually is.

trueLonger wavelengths correspond to

more energetic waves.false

The Launch PadMonday, 9/10/12

Put these into the order in which they came to be:

spacematterenergytime

1

1

1

4

Announcements• Quiz 3 this Friday.

Assignment Currently Open

Summative or

Formative?Date Issued Date Due Date Into

GradeSpeed Final Day

ESS Class Information Sheet F1 8/27 8/28

ESS Class Procedures and

ExpectationsF2 8/27 8/29

Quiz 1 S1 8/31 8/31 8/31 9/14

Lab - Hubble’s Law - the

Expanding Universe

F3 9/4 9/6

Quiz 2 S2 9/7 9/7 9/7 9/21

??

Recent Events in ScienceCuriosity Preps for Arm-Work Phase

 After driving more than a football field's length since landing,

NASA's Mars rover Curiosity is spending several days preparing

for full use of the tools on its arm. 

Curiosity extended its robotic arm Wednesday in the first of 6-10 consecutive days of planned

activities to test the 7-foot (2.1-meter) arm and the tools it

manipulates. 

http://www.nasa.gov/mission_pages/msl/news/msl20120905.html

Read all about it!

The Fundamental Forces Emerge The four fundamental forces in our Universe emerged

very quickly after the Big Bang creation event. Gravity formed first, followed by: the strong nuclear force the weak nuclear force electromagnetism

Some time after, the hydrogen gas and the dust that sprang into being at the moment of creation began to coalesce under the influence of gravity.

How the Universe

Works: The Big Bang

Part 6

Early Universe Formation

Video

How the Universe

Works: The Big Bang

Part 7

Stars and Galaxies Begin

to Form

Video

The first galaxies seem to have been born sooner after the Big Bang than

previously thought.

The First Galaxies

Using the galaxy cluster Abell 383 (center) as a

"gravitational lens," astronomers identified a

galaxy so far away we see it as it was 950 million years

after the Big Bang. It is visible as two tiny dots on either side of Abell 383. Distant objects seen through gravitational

lenses are typically multiply imaged and heavily distorted.

CREDIT: NASA

The first galaxies may have formed much earlier than thought, a new study suggests: just 200 million years

or so after the birth of the Universe.Using several different telescopes, astronomers have

discovered a distant galaxy whose stars appear to have formed 200 million years after the Big Bang, the explosive event that brought the universe into being.That's about 300 million years earlier than the oldest

previously known galaxies. The universe itself is estimated to be 13.7 billion years old.

The First Galaxies

The finding could force astronomers to rethink what they seem to know about the cosmos and its early

days, researchers said.

"This challenges theories of how soon galaxies formed and evolved in the first years of the universe," study

lead author Johan Richard, of France's Center of Astronomical Research of Lyon, said in a statement.

"It could even help solve the mystery of how the hydrogen fog that filled the early universe was

cleared.”

The First Galaxies

The newfound galaxy is not the farthest-flung galaxy ever detected; several with younger stars have been spotted at

greater distances, the researchers said.

Richard and his team spotted the new galaxy with two NASA instruments, the Hubble Space Telescope and the Spitzer

Space Telescope.They detected the galaxy through a cluster of galaxies called

Abell 383, whose powerful gravity bends light rays almost as a magnifying glass would.

The alignment of the newfound galaxy, Abell 383 and Earth amplified the galaxy's light, allowing the researchers to make

detailed observations.

The First Galaxies

Without this big lens in space, we could not study galaxies this faint with currently available observing facilities,” said study co-

author Eiichi Egami of the University of Arizona.

“Thanks to nature, we have this great opportunity to see our universe as it was eons ago.”

Using the Keck-2 telescope in Hawaii, the team then analyzed the galaxy's light, determining its redshift.

"Redshift" measures the distance that an object has moved away from Earth as space expands, through observations of the

stretching of the object's light to longer (or redder) wavelengths.

The First Galaxies

Light from objects moving away from us shifts to the red end of the spectrum as its wavelengths are stretched.

The shift, known as the Doppler phenomenon, is experienced on Earth when sound waves from an ambulance change pitch

when the ambulance moves toward you versus away from you.

Astronomers use redshift measurements to determine an object's distance, and by extension its age.

The bigger the redshift, the greater the distance.

The First Galaxies

A diagram (not to scale) of how gravitational lensing

works.

The First Galaxies

The newfound galaxy’s redshift turned out to be 6.027, which indicates that astronomers are viewing it the way it appeared

when the universe was around 950 million years old.

However, the stars in the galaxy appear to be at least 750 million years old, meaning that they must have formed just

200 million years or so after the Big Bang.That’s a few hundred million years earlier than astronomers

had thought galaxy formation first started.

Other studies had detected farther-flung galaxies that seem to have formed about 500 million years after the universe’s

birth.

The First Galaxies

"Our work confirms some earlier observations that had hinted at the presence of old stars in early

galaxies," said co-author Dan Stark, of the University of Cambridge in the United Kingdom.

"This suggests that the first galaxies have been around for a lot longer than previously thought.”

Richard and his team publish their results in an upcoming issue of the Monthly Notices of the Royal

Astronomical Society.

The First Galaxies

The discovery has implications beyond the question of when galaxies first formed, researchers said.

For example, it may help explain how the universe became "reionized."

About 300,000 years after the Big Bang, the hydrogen in the universe was neutral, meaning it carried no charge.Over the course of the next1 billion years, however,

something threw off enough radiation to ionize most of this hydrogen, splitting it into its constituent electrons and

protons.This re-ionization made the hydrogen transparent to

ultraviolet light, clearing the "fog" of the early universe.

The First Galaxies

Astronomers suspected that the radiation that powered this re-ionization must have come from galaxies.

But researchers had not found enough old, distant candidate galaxies to provide the necessary radiation.

The new study may help solve this enigma, researchers said.“It seems probable that there are in fact far more galaxies out

there in the early universe than we previously estimated — it’s just that many galaxies are older and fainter, like the one we have just discovered,” said co-author Jean-Paul Kneib, of

the Laboratoire d’Astrophysique de Marseille in France.

The First Galaxies

As of today, we can discover these galaxies only by observing them through massive clusters that act as cosmic telescopes,

as Abell 383 does.NASA's next-generation James Webb Space Telescope,

however, will specialize in high-resolution observations of distant, highly redshifted objects.

The James Webb Space Telescope, an infrared space observatory slated to launch no earlier than autumn 2015,

could help solve this and other cosmic mysteries, researchers said.

http://www.space.com/11380-big-bang-evidence-universe-trillion-years.html

The First Galaxies