Imagine Magazine - Johns Hopkins - September/October 2011 - (Page 23)

X-rAY: NASA/CXC/JHU/K.KUNTZ ET AL; OPTICAL: NASA/ESA/STSCI/JHU/K.KUNTZ ET AL; Ir: NASA/JPL-CALTECH/STSCI/K. GOrDON Image of Spiral galaxy Messier 101, a composite of data from Chandra, Hubble, and Spitzer astronomers using other methods, but Kepler, launched in 2009, is able to find planets that are much smaller and that might orbit sun-like stars—in other words, Earth-like planets. Kepler finds such planets by measuring faint fluctuations of light when such planets pass in front of their parent stars. This miniature eclipse, called a transit, causes a temporary reduction in light from that star. Repeated, regular transits indicate a planet. The transit time determines the planet’s size, while the interval between transits indicates the size of its orbit. In addition to exoplanets, Kepler could also be instrumental in locating as many as a dozen exomoons—Earth-sized satellites that orbit giant planets in the habitable zones of distant stars. the James Webb Space Telescope (JWST), scheduled for launch in 2018, will use a combination of infrared and visible light to see over 13 billion light-years away to the first galaxies formed in the universe. Orbiting 1.5 million miles from Earth, it will also be able to observe supernovae and black holes. In addition, JWST will be capable of detecting oceans on exoplanets—an indication of the possibility of life forms in other solar systems in our own galaxy. Imagine thanks Drs. Marc Postman and Massimo Stiavelli of the Space Telescope Science Institute for their invaluable advice in the preparation of this article. different Telescopes See different Facets of the Cosmos Why do we need a variety of space telescopes, many of them operating at the same time? Di erent aspects of space are observable in di erent types of light, which include radio waves, microwaves, infrared, visible, ultraviolet, x-rays, and gamma rays. This electromagnetic spectrum is further divided by wavelengths, or frequencies. To explore our galaxy and the distant universe in a range of di erent wavelengths, visit www.chromoscope.net. Solving the Biggest Mysteries of Astronomy With vision 100 times more powerful than the Hubble, Learn more about telescopes: Cool Cosmos http://coolcosmos.ipac.caltech.edu www.cty.jhu.edu/imagine Scope It Out! www.jwst.nasa.gov/scope.html imagine 23 http://www.chromoscope.net http://coolcosmos.ipac.caltech.edu http://www.jwst.nasa.gov/scope.html http://www.cty.jhu.edu/imagine

Table of Contents for the Digital Edition of Imagine Magazine - Johns Hopkins - September/October 2011

Imagine Magazine - Johns Hopkins - September/October 2011
Contents
Big Picture
In My Own Words
Physics Is…
Making the Team
Nuclear by Nature
Physics: The Next Generation
Telescopic Views
Exploring the Mysterious Lives of Stars
Around the Universe in Three Weeks
Selected Opportunities & Resources
Book Buddies
Meeting the (Economics) Challenge
Off the Shelf
Word Wise
Exploring Career Options
One Step Ahead
Planning Ahead for College
Students Review
Creative Minds Imagine
Mark Your Calendar
Knossos Games

Imagine Magazine - Johns Hopkins - September/October 2011

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