Free Republic 4th Quarter Fundraising Target: $88,000 Receipts & Pledges to-date: $19,958
22%  
Woo hoo!!! And the first 22% is in!! Thank you all very much!! God bless.

Keyword: comets

Brevity: Headers | « Text »
  • Astronomers find cyanide gas in interstellar object 2I/Borisov

    10/08/2019 8:22:09 AM PDT · by BenLurkin · 21 replies
    phys.org ^ | 10/07/2019 | Mat Williams
    C/2019 Q4 (Borisov) this summer provided renewed opportunities to study material left by outgassing. Using data gathered by the William Herschel Telescope (WHT), an international team of astronomers found that 2I/Borisov contains cyanide. Since comets and asteroids are essentially material left over from the formation of a planetary system, these studies will allow scientists to place constraints on the physical and chemical processes involved in the formation of extrasolar planets. Basically, it's like being able to study extrasolar planets without having to go there physically. Prof. Fitzsimmons told Universe Today, materials from other planetary systems, delivered to our doorstep—or at...
  • Astronomy Picture of the Day -- Big Dipper, Deep Sky

    01/22/2016 10:26:00 PM PST · by SunkenCiv · 12 replies
    NASA ^ | January 23, 2016 | (see photo credit)
    Explanation: The Big Dipper is an easy to recognize, well-known asterism in northern skies, though many see the Plough or Wagon. Famous bright nebulae of the north can also be found along its familiar lines, highlighted in this carefully composed scene with telescopic insets framed in the wider-field skyview. All from Messier's catalog, M101 and M51 are cosmic pinwheel and whirlpool on the left, spiral galaxies far beyond the Milky Way. To the right, M108, a distant edge-on spiral galaxy is seen close to our galaxy's own owl-faced planetary nebula M97. Taken on January 16, the wider-field view seems to...
  • Astronomy Picture of the Day -- Comets and Bright Star

    01/06/2016 12:14:43 AM PST · by SunkenCiv · 3 replies
    NASA ^ | January 06, 2016 | (see photo credit)
    Explanation: This timely, telescopic, two panel mosaic spans about 10 full moons across planet Earth's predawn skies. Recorded as the year began from Tenerife, Canary Islands, near the top of the frame are the faint coma and tail of Comet Borrelly (P/19). A comet with a seven year orbital period, Borrelly's nucleus was visited by the ion propelled spacecraft Deep Space 1 near the beginning of the 21st century. Anchoring the scene at the bottom is brilliant star Arcturus (Alpha Bootes) and Comet Catalina (C/2013 US10) a first time visitor from the Oort Cloud. Catalina's yellowish dust tail extends below...
  • Astronomy Picture of the Day -- Comet Catalina Tails

    01/01/2016 10:28:53 AM PST · by SunkenCiv · 5 replies
    NASA ^ | January 01, 2016 | (see photo credit)
    Explanation: A new year's treat for binoculars, as 2016 begins Comet Catalina (C/2013 US10) now sweeps through planet Earth's predawn skies near bright Arcturus, alpha star of Bootes. But this telescopic mosaic from December 21 follows the pretty tails of the comet across a field of view as wide as 10 full moons. The smattering of distant galaxies and faint stars in the background are in the constellation Virgo. Trailing behind the comet's orbit, Catalina's dust tail fans out below and left in the frame. Its ion tail is angled toward the top right, away from the Sun and buffeted...
  • Astronomy Picture of the Day -- Comet Meets Moon and Morning Star

    12/11/2015 11:38:43 PM PST · by SunkenCiv · 16 replies
    NASA ^ | December 12, 2015 | (see photo credit)
    Explanation: A crescent Moon and brilliant Venus met in predawn skies on December 7, a beautiful conjunction of planet Earth's two brightest celestial beacons after the Sun. Harder to see but also on the scene was Comet Catalina (C/2013 US10). The fainter comet clearly sporting two tails, lunar night side, bright sunlit lunar crescent, and brilliant morning star, are all recorded here by combining short and long exposures of the same field of view. Pointing down and right, Catalina's dust tail tends to trail behind the comet's orbit. Its ion tail, angled toward the top left of the frame, is...
  • Surprising Recent Discoveries of Three Large Near-Earth Objects

    02/17/2014 7:24:07 PM PST · by SunkenCiv · 18 replies
    NASA/JPL Near-Earth Object Program Office ^ | November 5, 2013 | Don Yeomans and Paul Chodas
    The first of the new large near-Earth asteroid discoveries is named 2013 UQ4, and it is perhaps the most unusual. This approximately 19-kilometer (12-mile) wide object was spotted by the Catalina Sky Survey on Oct. 23 when the asteroid was 435 million kilometers (270 million miles) away from Earth. Not only is this object unusually large, it follows a very unusual highly inclined, retrograde orbit about the Sun, which means it travels around the Sun in the opposite direction of all the planets and the vast majority of asteroids. The only objects usually found in retrograde orbits are comets, which...
  • Proof of 'Planet Nine' May Be Sewn into Medieval Tapestries

    02/28/2019 8:50:11 PM PST · by SunkenCiv · 45 replies
    Live Science ^ | May 4, 2018 | Stephanie Pappas
    The records include dates and times, Cesario said, which makes them useful to modern-day astronomers. Planet Nine, if it exists, would have about 10 times the mass of Earth and orbit 20 times farther from the sun than Neptune does... Scientists suspect the existence of Planet Nine because it would explain some of the gravitational forces at play in the Kuiper Belt, a stretch of icy bodies beyond Neptune. But no one has been able to detect the planet yet, though astronomers are scanning the skies for it with tools such as the Subaru Telescope on Hawaii's Mauna Kea volcano....
  • How to See the Bright Green Comet 21P in Binoculars on Monday

    09/09/2018 9:10:50 AM PDT · by ETL · 16 replies
    Space.com ^ | September 9, 2018 | Elizabeth Howell, Space.com Contributor
    Want to see a comet whizzing by Earth? A great chance to catch one of these celestial visitors is overnight tonight, when Comet 21P/Giacobini-Zinner will be best visible in binoculars or a telescope. The comet, also known as "21P," will make its closest approach to Earth at around 2:30 a.m. EDT Monday (630 GMT). The bright-green comet should reach a visual magnitude of 6.5 to 7, according to EarthSky.org. This makes 21P almost bright enough to see with the naked eye — but not quite. [Bright Comets of 2018: When, Where and How to See Them] To find Comet 21P...
  • The Solar System: Old Or Young? Part II

    09/07/2018 9:35:38 AM PDT · by Patriot777 · 53 replies
    09/07/2018 | Patriot777
    The larger planets such as Saturn, Jupiter and Uranus remarkably put off more energy than they absorb from our sun. If they were actually in the billions of years of age, should they not have become frozen and expired an incalculable length of time ago. Scientists in this field have come up with many reasons as to the how that these celestial entities kept their heat as far as their theories; however, their noses are firmly planted in a major wall that repels everything they've come up with. Volcanism observed on Jupiter's Io and the geyers with Saturn's Enceladus command...
  • A close call of 0.8 light years [Nibiru?]

    02/22/2015 7:43:37 AM PST · by Red Badger · 38 replies
    Phys.Org ^ | Provided by University of Rochester
    A group of astronomers from the US, Europe, Chile and South Africa have determined that 70,000 years ago a recently discovered dim star is likely to have passed through the solar system's distant cloud of comets, the Oort Cloud. No other star is known to have ever approached our solar system this close - five times closer than the current closest star, Proxima Centauri. In a paper published in Astrophysical Journal Letters, lead author Eric Mamajek from the University of Rochester and his collaborators analyzed the velocity and trajectory of a low-mass star system nicknamed "Scholz's star." The star's trajectory...
  • Star Blasted Through Solar System 70,000 Years Ago

    02/18/2015 1:11:46 PM PST · by BenLurkin · 113 replies
    discovery.com ^ | Ian O'Neill
    Highlighted by astronomers at the University of Rochester and the European Southern Observatory, the star — nicknamed “Scholz’s star” — has a very low tangential velocity in the sky, but it has been clocked traveling at a breakneck speed away from us. In other words, from our perspective, Scholz’s star is fleeing the scene of a collision with us. “Most stars this nearby show much larger tangential motion,” said Eric Mamajek, of the University of Rochester. “The small tangential motion and proximity initially indicated that the star was most likely either moving towards a future close encounter with the solar...
  • A star disturbed the comets of the solar system 70,000 years ago

    03/20/2018 8:40:10 PM PDT · by BenLurkin · 59 replies
    sciencedaily.com ^ | March 20, 2018 | FECYT - Spanish Foundation for Science and Technology
    Scholz's star -- named after the German astronomer who discovered it -- approached less than a light-year from the Sun. Nowadays it is almost 20 light-years away, but 70,000 years ago it entered the Oort cloud, a reservoir of trans-Neptunian objects located at the confines of the solar system. ... Now two astronomers from the Complutense University of Madrid, the brothers Carlos and Raúl de la Fuente Marcos, together with the researcher Sverre J. Aarseth of the University of Cambridge (United Kingdom), have analyzed for the first time the nearly 340 objects of the solar system with hyperbolic orbits (very...
  • Rosetta’s 67P Is The Result Of A Collision Of Two Comets

    03/09/2018 9:41:33 AM PST · by BenLurkin · 1 replies
    Universe Today ^ | March 9, 2018 | Evan Gough
    Ever since we’ve been able to get closer looks at comets in our Solar System, we’ve noticed something a little puzzling. Rather than being round, they’re mostly elongated or multi-lobed. This is certainly true of Comet 67P/Churyumov-Gerasimenko (67P or Chury for short.) A new paper from an international team coordinated by Patrick Michel at France’s CNRS explains how they form this way. The European Space Agency (ESA) spacecraft Rosetta visited 67P in 2014, end even placed its lander Philae on the surface. Rosetta spent 17 months orbiting 67P, and at its closest approach, Rosetta was only 10 km (6 mi)...
  • Rare Comet Visiting Inner Solar System For The First Time To Be Visible From Earth This January

    01/03/2017 8:35:33 PM PST · by BenLurkin · 46 replies
    Tech Times ^ | 3 January 2017, 5:47 am EST | Allan Adamson
    Seeing Comet C/2016 U1 NEOWISE fly by would be a rare opportunity for skygazers because the celestial body won't likely pass by Earth for the next thousands of years. Unlike short period comets such as Halley's, a comet which passes by our planet every 75 to 80 years, it would take C/2016 U1 NEOWISE far longer time before it gets to visit this region of the solar system again. ... Paul Chodas, from NASA's Center for Near-Earth Object (NEO) Studies, said that there is a good chance that the object will be visible from Earth using a good pair of...
  • Centaurs Keep Their Rings From Greedy Gas Giants

    06/26/2016 10:36:02 AM PDT · by BenLurkin · 14 replies
    universetoday.com ^ | 06/24/2016 | Matt Williams
    Centaurs are a population of objects within our Solar System that behave as both comets and asteroids (hence why they are named after the hybrid beasts of Greek mythology). 10199 Chariklo is the largest known member of the Centaur population, a possible former Trans-Neptunian Object (TNO) which currently orbits between Saturn and Uranus. The rings around this asteroid were first noticed in 2013 when the asteroid underwent a stellar occultation. This revealed a system of two rings, with a radius of 391 and 405 km and widths of about 7 km 3 km, respectively. The absorption features of the rings...
  • 'Alien Megastructure' Star Only Gets More Mysterious

    05/22/2016 6:39:00 PM PDT · by 2ndDivisionVet · 53 replies
    Popular Science ^ | May 10, 2016 | Sarah Fecht
    Every now and then, a distant star called KIC 8462852 dims by as much as 20 percent. That's huge. Even a passing planet as big as Jupiter would only block about 1 percent of the star's light. Ruling out a planet, scientists have no idea what could be eclipsing the star (which is informally known as 'Tabby's Star'). The leading hypothesis is a family of really big comets, but that doesn't quite fit. Astronomer Jason Wright pointed out that the light patterns are consistent with what we'd expect if aliens had built a Dyson swarm of solar collectors around the...
  • New study supports natural causes, not alien activity, explain mystery star's behavior

    05/09/2016 8:56:03 PM PDT · by rdl6989 · 16 replies
    phys.org ^ | May 9, 2016 | David Salisbury
    Sorry, E.T. lovers, but the results of a new study make it far less likely that KIC 8462852, popularly known as Tabby's star, is the home of industrious aliens who are gradually enclosing it in a vast shell called a Dyson sphere. Public interest in the star, which sits about 1,480 light-years away in the constellation Cygnus, began last fall when Yale astronomer Tabetha ("Tabby") Boyajian and colleagues posted a paper on an astronomy preprint server reporting that "planet hunters" - a citizen science group formed to search data from the Kepler space telescope for evidence of exoplanets - had...
  • Dimming star remains mystery, but it's likely not caused by comets

    01/16/2016 5:52:31 PM PST · by BenLurkin · 15 replies
    cnn ^ | jareen imam
    Theories surrounding the star system KIC 8462852, also known as Tabby's Star, ranged from comets to an "alien megastructure" after the online astronomy crowdsourcing site Planet Hunter discovered an unusual light fluctuation in the star system a few years ago. A new analysis of KIC 8462852 shows that the star system, which lies about 1,500 light years away, has been gradually dimming for more than a century, and it's likely not caused by a cloud of orbiting comets. Bradley Schaefer, a physics and astronomy professor at Louisiana State University, examined data from a Harvard University archive of digitally scanned photographic...
  • 'Alien Megastructure' Mystery May Soon Be Solved

    10/28/2015 12:56:27 PM PDT · by ETL · 59 replies
    Space.com ^ | October 28, 2015 | Mike Wall - Space.com Senior Writer
    The mystery behind a strangely dimming star could soon be solved. Astronomers around the world are keeping a close eye on the star KIC 8462852, which has dimmed dramatically numerous times over the past few years, dropping in brightness by up to 22 percent. These big dips have spurred speculation that the star may be surrounded by some type of alien megastructure — a hypothesis that will be put to the test if and when KIC 8462852 dims again. "As long as one of those events occurs again, we should be able to catch it in the act, and then...
  • SETI Institute undertakes search for alien signal from Kepler Star KIC 8462852

    10/24/2015 5:31:16 AM PDT · by Momaw Nadon · 16 replies
    PHYS.ORG ^ | October 22, 2015 | Bob King
    "We either caught something shortly after an event like two planets crashing together or alien intelligence," said Dr. Gerald Harp, senior scientist at the SETI Institute in Mountain View, California, referring to the baffling light variations seen in the Kepler star KIC 8462852. And he and a team from the Institute are working hard at this moment to determine which of the two it is. Beginning last Friday (Oct. 16), the Institute's Allen Telescope Array (ATA) was taken off its normal survey schedule and instead focused on KIC 8462852, one of the 150,000-plus stars studied by NASA's Kepler Mission to...