Featured Research

from universities, journals, and other organizations

Space Shield Could Help Image Earth-like Planets, Says Study

Date:
July 6, 2006
Source:
University of Colorado at Boulder
Summary:
A gigantic, daisy-shaped space shield could be used to block out pesky starlight and allow telescope trailing thousands of miles behind it to image light from distant planets skimming by the giant petals without being swamped by light from the parent stars, said CU-Boulder Professor Webster Cash. Researchers could then identify planetary features like oceans, continents, polar capsastronomers using an orbiting telescope to zero in on Earth-like planets in other solar systems, according to a University of Colorado at Boulder study.

Roughly half the size of a football field, the starshade will be equipped with thrusters to move into the line of sight of distant stars.
Credit: CU-Boulder

A gigantic, daisy-shaped space shield could be used to block out pesky starlight and allow astronomers using an orbiting telescope to zero in on Earth-like planets in other solar systems, according to a University of Colorado at Boulder study.

The thin plastic "starshade" would allow a telescope trailing thousands of miles behind it to image light from distant planets skimming by the giant petals without being swamped by light from the parent stars, said CU-Boulder Professor Webster Cash. Researchers could then identify planetary features like oceans, continents, polar caps and cloud banks and even detect biomarkers like methane, oxygen and water if they exist, he said.

"We think this is a compelling concept, particularly because it can be built today with existing technology," said Cash. "We will be able to study Earth-like planets tens of trillions of miles away and chemically analyze their atmospheres for signs of life."

A paper on the subject by Cash is featured on the cover of the July 6 issue of Nature. The paper includes mathematical solutions to optical challenges like the bending and scattering of light between the pliable, 50-yard-in-diameter starshade and the space telescope, which would orbit in tandem roughly 15,000 miles apart.

Scientists would launch the telescope and starshade together into an orbit roughly 1 million miles from Earth, then remotely unfurl the starshade and use small thrusters to move it into lines of sight of nearby stars thought to harbor planets, said Cash. The thrusters would be intermittently turned on to hold the starshade steady during the observations of the planets, which would appear as bright specks.

"Think of an outfielder holding up one hand to block out the sunlight as he tracks a fly ball," said Cash, director of CU-Boulder's Center for Astrophysics and Space Astronomy. "We would use the starshade as a giant hand to suppress the light emanating from a central star by a factor of about 10 billion."

The novel concept could be used to map planetary systems around distant stars and detect planets as small as Earth's moon, said Cash. In recent years, more than 175 planets have been discovered orbiting other stars.

Dubbed the New Worlds Observer, Cash's design was selected for a $400,000 funding boost last October by NASA's Institute for Advanced Concepts after being selected for initial study in 2004. The team includes researchers from Princeton University, NASA's Goddard Space Flight Center, Ball Aerospace of Boulder, Northrop Grumman Corp. of Los Angeles and the Carnegie Institution in Washington, D.C.

The team also has submitted a $400 million proposal with NASA's Discovery Program to launch a stand-alone starshade to work in concert with the powerful James Webb Space Telescope. The James Webb Space Telescope is an infrared observatory slated for launch in 2013 and considered the successor to the Hubble Space Telescope.

Alternative proposals for imaging distant planets involve suppressing parent starlight once it has entered the telescope -- a complicated, Rube Goldberg-like undertaking involving shifting mirrors and active electronics, said Marc Kuchner of NASA's Goddard Space Flight Center's Exoplanets and Stellar Astrophysics Laboratory. "In contrast, this is a very clean and simple optical concept, and may be the most promising idea yet on how to directly image our Earth-like neighbors," said Kuchner, also a member of the New Worlds Observer science team.

"For over a century, science fiction writers have speculated on the existence of Earth-like planets around nearby stars," Cash wrote in Nature. "If they actually exist, use of an occulter could find them within the next decade."

An even more advanced version of the New Worlds Imager might involve a ring of telescopes placed on the moon beneath a fleet of orbiting starshades that would allow scientists to actually photograph distant, Earth-like planets, Cash speculated. "There is a bit of Buck Rogers in the New Worlds Imager concept, but seeking and mapping new lands is something that seems to ring deep in the human psyche."


Story Source:

The above story is based on materials provided by University of Colorado at Boulder. Note: Materials may be edited for content and length.


Cite This Page:

University of Colorado at Boulder. "Space Shield Could Help Image Earth-like Planets, Says Study." ScienceDaily. ScienceDaily, 6 July 2006. <www.sciencedaily.com/releases/2006/07/060706095650.htm>.
University of Colorado at Boulder. (2006, July 6). Space Shield Could Help Image Earth-like Planets, Says Study. ScienceDaily. Retrieved April 23, 2014 from www.sciencedaily.com/releases/2006/07/060706095650.htm
University of Colorado at Boulder. "Space Shield Could Help Image Earth-like Planets, Says Study." ScienceDaily. www.sciencedaily.com/releases/2006/07/060706095650.htm (accessed April 23, 2014).

Share This



More Space & Time News

Wednesday, April 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Nuclear-Level Asteroids Might Be More Common Than We Realize

Nuclear-Level Asteroids Might Be More Common Than We Realize

Newsy (Apr. 23, 2014) The B612 Foundation says asteroids strike Earth much more often than previously thought, and are hoping to build an early warning system. Video provided by Newsy
Powered by NewsLook.com
NASA Chief Outlines Plan for Human Mission to Mars

NASA Chief Outlines Plan for Human Mission to Mars

AFP (Apr. 22, 2014) NASA administrator Charles Bolden, speaking at the 'Human to Mars Summit' in Washington, says that learning more about the Red Planet can help answer the 'fundamental question' of 'life beyond Earth'. Duration: 00:48 Video provided by AFP
Powered by NewsLook.com
Nasa Gives You An Excuse to Post a Selfie on Earth Day

Nasa Gives You An Excuse to Post a Selfie on Earth Day

TheStreet (Apr. 22, 2014) NASA is inviting all social media users to take a selfie of themselves alongside nature and to post it to Twitter, Facebook, Flickr, Instagram, or Google Plus with the hashtag #globalselfie. NASA's goal is to crowd-source a collection of snapshots of the earth, ground-up, that will be used to create one "unique mosaic of the Blue Marble." This image will be available to all in May. Since this is probably one of the few times posting a selfie to Twitter won't be embarrassing, we suggest you give it a go for a good cause. Video provided by TheStreet
Powered by NewsLook.com
SpaceX's Dragon Spacecraft Captured by International Space Station

SpaceX's Dragon Spacecraft Captured by International Space Station

Reuters - US Online Video (Apr. 20, 2014) SpaceX's unmanned Dragon spacecraft makes a scheduled Easter Sunday rendezvous with the International Space Station. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins