Astronomy Now Home
Home Magazine Sky Chart Resources Store

On Sale Now!



The August 2014 issue of Astronomy Now is on sale! Order direct from our store (free 1st class post & to UK addresses). The Astronomy Now iPad/iPhone editions are now available worldwide on the App Store.



Top Stories



Earthshine used to test life detection method
...By imagining the Earth as an exoplanet, scientists observing our planet's reflected light on the Moon with ESO's Very Large Telescope have demonstrated a way to detect life on other worlds...
  READ MORE

Solid buckyballs discovered in space
...Astronomers using NASA’s Spitzer Space Telescope have detected a particular type of molecule, given the nickname “buckyball”, in a solid form for the first time...
  READ MORE

Steamy water-world gets the Hubble treatment
...Hubble Space Telescope observations of a 7 Earth-mass planet find an unusual water-rich world swathed in a thick, steamy atmosphere...
  READ MORE








Repaired Hubble showcases Southern Pinwheel
DR EMILY BALDWIN
ASTRONOMY NOW
Posted: November 05, 2009


Bookmark and Share

The sharp vision of Hubble's new Wide Field Camera 3 (WFC3) has captured swarms of young stars bursting into life in the curving arms of nearby spiral galaxy M83.

A close up view of the myriad stars near M83's bright, white core at right, with a ground-based view of the whole galaxy as seen by the European Southern Observatory’s Wide Field Imager on the ESO/MPG 2.2-metre telescope at La Silla, Chile, for context. The white box outlines Hubble’s view. Image: NASA, ESA, and the Hubble Heritage Team (STScI/AURA).

Known as the Southern Pinwheel galaxy, M83 also cocoons rapid star formation within its nucleus – spawning stars at a faster rate than in our own Milky Way Galaxy. This cauldron of star birth appears as the bright white region in the close up view of the galaxy's core.

Thanks to WFC3's broad wavelength range from ultraviolet to near-infrared, the image also picks out older generations of stars, including ancient hordes of globular star clusters and hundreds of thousands of individual stars – mostly blue and red supergiants.

Close up view of star formation in the M83's arms and core. Image: NASA, ESA, and the Hubble Heritage Team (STScI/AURA).

The unprecedented detail of the new image has allowed astronomers to probe deeper into the evolutionary history of star formation in this classic spiral galaxy than ever before. The newest generations of stars appear to be forming in clusters on the edges of the dark dust lanes, the backbone of the spiral arms. These stars are only a few million years old, their youthfulness betrayed by the bubbles of glowing red hydrogen gas surrounding them. Over time, radiation flung out from the newborns blows away the gas, revealing bright blue star clusters that are between one and ten million years old.

A bar of stars, gas, and dust slicing across the core of the galaxy may be funneling material to the galaxy’s centre where most of the star birth is occurring.

WFC3 also tracked down the remnants of some 60 supernova blasts – five times more than known previously in this region. Supernova explosions mark the end of a star's life, and by studying them, astronomers can gain insight into the nature of the progenitor star, which is responsible for the creation and dispersal of most of the galaxy’s heavy elements.

M83 is located 15 million light-years away in the southern constellation Hydra.

The Planets
From tiny Mercury to distant Neptune and Pluto, The Planets profiles each of the Solar System's members in depth, featuring the latest imagery from space missions. The tallest mountains, the deepest canyons, the strongest winds, raging atmospheric storms, terrain studded with craters and vast worlds of ice are just some of the sights you'll see on this 100-page tour of the planets.
 GET YOUR COPY

Hubble Reborn
Hubble Reborn takes the reader on a journey through the Universe with spectacular full-colour pictures of galaxies, nebulae, planets and stars as seen through Hubble's eyes, along the way telling the dramatic story of the space telescope, including interviews with key scientists and astronauts.
 GET YOUR COPY

3D Universe
Witness the most awesome sights of the Universe as they were meant to be seen in this 100-page extravaganza of planets, galaxies and star-scapes, all in 3D!
 GET YOUR COPY


HOME | NEWS ARCHIVE | MAGAZINE | SOLAR SYSTEM | SKY CHART | RESOURCES | STORE | SPACEFLIGHT NOW

© 2014 Pole Star Publications Ltd.