TribLIVE

| USWorld


 
Larger text Larger text Smaller text Smaller text | Order Photo Reprints

Astronomers find blue planet outside solar system

Daily Photo Galleries

By The Associated Press
Friday, July 12, 2013, 8:51 p.m.
 

LONDON — Astronomers for the first time have managed to determine the color of a planet outside our solar system, a blue gas giant 63 light-years away.

Using the Hubble Space Telescope, an international team said the planet known as HD 189733B would look like a deep blue dot if viewed up-close.

“Measuring the planet's color is a real first — we have never managed it before with a planet outside our own solar system,” Frederic Pont of the University of Exeter in England said on Friday.

While Earth looks blue from space because of its oceans, the astronomers said the planet's color was formed by a hazy turbulent atmosphere of silicate particles that scatter blue light. To determine the planet's color, the team measured the amount of light reflected off its surface as it passed behind its star.

Discovered in 2005, the planet belongs to a class of giant gas planets called “hot Jupiters” that orbit close to their stars. It has a daytime temperature of around 1,832 degrees, and the heat causes rocks to evaporate and glass to possibly rain sideways in howling 4,500-mph wind.

Astronomers chose the planet for observation because of its proximity to Earth and size in relation to the star it orbits. A light-year is nearly 6 trillion miles.

Pont said the technology the astronomers used pushed the Hubble telescope to its limit given the distance and light from other stars obscuring their view.

“People keep coming up with a better way of viewing planets indirectly, so I'm sure the technology will eventually improve,” Pont said.

 

 
 


Show commenting policy

Most-Read World

  1. OPEC to maintain crude oil output target
  2. Ukraine aims to ride reform to European Union
  3. Lack of money may crush ISIS
  4. U.S. military shifts strategy to smaller Iraq force
  5. Egypt’s fixation on dictator Mubarak trial wanes
  6. Bus station blast kills 40 in Nigeria
  7. Mexico targets local corruption
  8. 100 terrorists killed in Kenya retaliation act
  9. Putin says he won’t be Russia’s president for life
  10. Israeli Prime Minister Netanyahu agrees to delay ‘nationality’ bill
  11. Brits blame web services in soldier’s death
Subscribe today! Click here for our subscription offers.