Astronomy and Stars
Discussions about astronomy and stars. As we look further out what can we find in the universe beyond Earth's atmosphere?
2,045 topics in this forum
-
- 0 replies
- 489 views
In a dress rehearsal for the rendezvous between NASA's Deep Impact spacecraft and comet 9P/Tempel 1, the Hubble Space Telescope captured dramatic images of a new jet of dust and gas streaming from the icy comet. The images are a reminder that Tempel 1's icy nucleus, roughly half the size of Manhattan, is dynamic and volatile. Astronomers hope the eruption of dust seen in these observations is a preview of the fireworks that may come July 4, when a probe from the Deep Impact spacecraft slams into the comet, possibly blasting off material and giving rise to a similar plume of dust and gas. View the full article
Last reply by HubbleSite, -
- 0 replies
- 453 views
The top view, taken by NASA's Hubble Space Telescope is the most detailed visible-light image ever taken of a narrow, dusty ring around the nearby star Fomalhaut (HD 216956). The image offers the strongest evidence yet that an unruly and unseen planet may be gravitationally tugging on the ring. The left part of the ring is outside the telescope's view. Hubble unequivocally shows that the center of the ring is a whopping 1.4 billion miles (15 astronomical units) away from the star. This is a distance equal to nearly halfway across our solar system. The geometrically striking ring, tilted obliquely toward Earth, would not have such a great offset if it were simply being inf…
Last reply by HubbleSite, -
- 0 replies
- 509 views
Dr. Mattias (Matt) Mountain has been appointed director of the Space Telescope Science Institute (STScI) in Baltimore, the science operations center for NASA's Hubble Space Telescope and the planned James Webb Space Telescope (JWST). He will succeed Dr. Steven V. W. Beckwith, who will end his term Sept. 1. View the full article
Last reply by HubbleSite, -
- 0 replies
- 490 views
A violent and chaotic-looking mass of gas and dust is seen in this Hubble Space Telescope image of a nearby supernova remnant. Denoted N 63A, the object is the remains of a massive star that exploded, spewing its gaseous layers out into an already turbulent region. View the full article
Last reply by HubbleSite, -
- 0 replies
- 477 views
On July 4, NASA's Deep Impact spacecraft will attempt an extraordinarily daring encounter with the far-flung comet Tempel 1 hurtling through space at tens of thousands of miles per hour. As if that is not challenging enough, the comet's size, shape and other characteristics are not entirely known. Two of NASA's eyes in the sky, the Spitzer and Hubble Space Telescopes, helped scientists prepare for the comet encounter. From their orbits high above Earth, the telescopes watched Tempel 1 in early 2004. Together they came up with the best estimates of the comet's size, shape, reflectivity and rotation rate. The data may help Deep Impact snap pictures of the dramatic rendezv…
Last reply by HubbleSite, -
- 0 replies
- 417 views
During the 15 years NASA's Hubble Space Telescope has orbited the Earth, it has taken more than 700,000 photos of the cosmos; images that have awed, astounded and even confounded astronomers and the public. NASA released new views today of two of the most well-known objects Hubble has ever observed: the Whirlpool Galaxy (spiral galaxy M51) [left] and the Eagle Nebula [right]. These new images are among the largest and sharpest Hubble has ever taken. They were made with Hubble's newest camera, the Advanced Camera for Surveys (ACS). The images are so incredibly sharp, they could be enlarged to billboard size and still retain stunning details. For the 15th anniversary, s…
Last reply by HubbleSite, -
- 0 replies
- 450 views
Like dust bunnies that lurk in corners and under beds, surprisingly complex loops and blobs of cosmic dust lie hidden in the giant elliptical galaxy NGC 1316. This image made from data obtained with the NASA Hubble Space Telescope reveals the dust lanes and star clusters of this giant galaxy that give evidence that it was formed from a past merger of two gas-rich galaxies. View the full article
Last reply by HubbleSite, -
- 0 replies
- 392 views
Unlike humans, stars are born with all the weight they will ever have. A human's birth weight varies by just a few pounds, but a star's weight ranges from less than a tenth to more than 100 times the mass of our Sun. Although astronomers know that stars come in a variety of masses, they are still stumped when it comes to figuring out if stars have a weight limit at birth. Now astronomers have taken an important step toward establishing a weight limit for stars. Using NASA's Hubble Space Telescope, astronomers made the first direct measurement within our Milky Way Galaxy that stars have a limit to how large they can form. Studying the densest known cluster of stars in our …
Last reply by HubbleSite, -
- 0 replies
- 479 views
What happens when a galaxy falls in with the wrong crowd? The irregular galaxy NGC 1427A is a spectacular example of the resulting stellar rumble. Under the gravitational grasp of a large gang of galaxies, called the Fornax cluster, the small bluish galaxy is plunging headlong into the group at 600 kilometers per second or nearly 400 miles per second. View the full article
Last reply by HubbleSite, -
- 0 replies
- 387 views
The dancing light of the auroras on Saturn behaves in ways different from how scientists have thought possible for the last 25 years. New research by a team of astronomers led by John Clarke of Boston University has overturned theories about how Saturn's magnetic field behaves and how its auroras are generated. View the full article
Last reply by HubbleSite, -
- 0 replies
- 410 views
Dr. Riccardo Giacconi, founding director of the Space Telescope Science Institute (STScI), will receive the 2003 National Medal of Science -- the United States' top scientific recognition -- for his work in X-ray astronomy and his outstanding leadership in the development of the STScI. The White House announced the list of recipients on February 14. Giacconi and the others will receive their medals in a White House ceremony on Monday, March 14. View the full article
Last reply by HubbleSite, -
- 0 replies
- 390 views
The American Astronomical Society (AAS) has endorsed a new set of recommendations to improve the status of gender equity in astronomy. The recommendations, endorsed at the 205th meeting of the Society in San Diego from January 8 to 13, 2005, were prepared by the Society's Committee on the Status of Women in Astronomy (CSWA). View the full article
Last reply by HubbleSite, -
- 0 replies
- 406 views
The Hubble Space Telescope's latest image of the star V838 Monocerotis (V838 Mon) reveals dramatic changes in the illumination of surrounding dusty cloud structures. The effect, called a light echo, has been unveiling never-before-seen dust patterns ever since the star suddenly brightened for several weeks in early 2002. View the full article
Last reply by HubbleSite, -
- 0 replies
- 454 views
Astronomers using NASA's Hubble Space Telescope have uncovered for the first time a population of embryonic stars in the Small Magellanic Cloud, a companion galaxy of our Milky Way. Hubble's exquisite sharpness plucked out an underlying population of embryonic stars embedded in the nebula NGC 346 that are still forming from gravitationally collapsing gas clouds. They have not yet ignited their hydrogen fuel to sustain nuclear fusion. The smallest of these infant stars is only half the mass of our Sun. View the full article
Last reply by HubbleSite, -
- 0 replies
- 517 views
One of the largest Hubble Space Telescope images ever made of a complete galaxy is being unveiled today at the American Astronomical Society meeting in San Diego, Calif. The Hubble telescope captured a display of starlight, glowing gas, and silhouetted dark clouds of interstellar dust in this 4-foot-by-8-foot image of the barred spiral galaxy NGC 1300. View the full article
Last reply by HubbleSite, -
- 0 replies
- 434 views
The Hubble Space Telescope's near-infrared vision is hot on the trail of a possible planetary companion to a relatively bright young brown dwarf located 225 light-years away in the southern constellation Hydra. Astronomers at the European Southern Observatory's Very Large Telescope (VLT) in Chile detected the planet candidate in April 2004 with infrared observations. The astronomers spotted a faint companion object to the brown dwarf, called 2MASSWJ 1207334-393254 (2M1207). They suspect the companion is a planet because it is dimmer and cooler than the brown dwarf. Because a planet beyond our solar system has never been imaged directly, this remarkable observation require…
Last reply by HubbleSite, -
- 0 replies
- 421 views
Looks can be deceiving, especially when it comes to celestial objects like galaxies and nebulas. These objects are so far away that astronomers cannot see their three-dimensional structure. The Helix Nebula, for example, resembles a doughnut in colorful images. Earlier images of this complex object – the gaseous envelope ejected by a dying, sun-like star – did not allow astronomers to precisely interpret its structure. One possible interpretation was that the Helix's form resembled a snake-like coil. Now, a team of astronomers using NASA's Hubble Space Telescope has established that the Helix's structure is even more perplexing. Their evidence suggests that the Helix cons…
Last reply by HubbleSite, -
- 0 replies
- 371 views
Two of NASA's Great Observatories, the Spitzer Space Telescope and the Hubble Space Telescope, have provided astronomers an unprecedented look at dusty planetary debris around stars the size of our sun. Spitzer has discovered for the first time dusty discs around mature, sun-like stars known to have planets. Hubble captured the most detailed image ever of a brighter disc circling a much younger sun-like star. The findings offer "snapshots" of the process by which our own solar system evolved, from its dusty and chaotic beginnings to its more settled present-day state. Debris disks are composed of the shattered remnants of small bodies such as comets and asteroids that c…
Last reply by HubbleSite, -
- 0 replies
- 426 views
Scientists using NASA's Hubble Space Telescope have measured the age of what may be the youngest galaxy ever seen in the universe. By cosmological standards it is a mere toddler seemingly out of place among the grown-up galaxies around it. Called I Zwicky 18, it may be as young as 500 million years old (so recent an epoch that complex life had already begun to appear on Earth). Our Milky Way galaxy by contrast is over 20 times older, or about 12 billion years old, the typical age of galaxies across the universe. This "late-life" galaxy offers a rare glimpse into what the first diminutive galaxies in the early universe look like. View the full article
Last reply by HubbleSite, -
- 0 replies
- 500 views
While analyzing NASA Hubble Space Telescope images of the Sagittarius dwarf irregular galaxy (SagDIG), an international team of astronomers led by Simone Marchi, Yazan Momany, and Luigi Bedin discovered 13 sucessive faint trails left by a tiny asteroid. The trails are seen as a series of reddish arcs on the right in this August 2003 Advanced Camera for Surveys image. View the full article
Last reply by HubbleSite, -
- 0 replies
- 530 views
At first glance, Jupiter looks like it has a mild case of the measles. Five spots - one colored white, one blue, and three black - are scattered across the upper half of the planet. Closer inspection by NASA's Hubble Space Telescope reveals that these spots are actually a rare alignment of three of Jupiter's largest moons - Io, Ganymede, and Callisto - across the planet's face. In this image, the telltale signatures of this alignment are the shadows [the three black circles] cast by the moons. Io's shadow is located just above center and to the left; Ganymede's on the planet's left edge; and Callisto's near the right edge. Only two of the moons, however, are visible in th…
Last reply by HubbleSite, -
- 0 replies
- 429 views
An international team of astronomers is announcing today that they have identified the probable surviving companion star to a titanic supernova explosion witnessed in the year 1572 by the great Danish astronomer Tycho Brahe and other astronomers of that era. This discovery provides the first direct evidence supporting the long-held belief that Type Ia supernovae come from binary star systems containing a normal star and a burned-out white dwarf star. The normal star spills material onto the dwarf, which eventually triggers an explosion. View the full article
Last reply by HubbleSite, -
- 0 replies
- 520 views
Four hundred years ago, sky watchers, including the famous astronomer Johannes Kepler, were startled by the sudden appearance of a "new star" in the western sky, rivaling the brilliance of the nearby planets. Now, astronomers using NASA's three Great Observatories are unraveling the mysteries of the expanding remains of Kepler's supernova, the last such object seen to explode in our Milky Way galaxy. View the full article
Last reply by HubbleSite, -
- 0 replies
- 419 views
Detailed analyses of mankind's deepest optical view of the universe, the Hubble Ultra Deep Field (HUDF), by several expert teams have at last identified, what may turn out to be, the earliest star-forming galaxies. Astronomers are now debating whether the hottest stars in these early galaxies may have provided enough radiation to "lift a curtain" of cold, primordial hydrogen that cooled after the big bang. This is a problem that has perplexed astronomers over the past decade, and NASA's Hubble Space Telescope has at last glimpsed what could be the "end of the opening act" of galaxy formation. These faint sources illustrate how astronomers can begin to explore when the fir…
Last reply by HubbleSite, -
- 0 replies
- 500 views
In this detailed view from NASA's Hubble Space Telescope, the so-called Cat's Eye Nebula looks like the penetrating eye of the disembodied sorcerer Sauron from the film adaptation of "The Lord of the Rings." The nebula, formally cataloged NGC 6543, is every bit as inscrutable as the J.R.R. Tolkien phantom character. Though the Cat's Eye Nebula was one of the first planetary nebulae to be discovered, it is one of the most complex such nebulae seen in space. View the full article
Last reply by HubbleSite,