Google+

Stars Suspected of Hosting Large Debris Disk

About 80 light-years away, an enormous, dusty ring swirls around a sunlike star, with a defined inner edge that is probably sculpted by a planet orbiting at 140 times Earth’s distance from the sun.

A planet located so far from a sunlike star presents an astronomical conundrum.

“How do you get a planet out that far? We don’t know how to form something out there,” astronomer Karl Stapelfeldt of NASA’s Goddard Space Flight Center in Greenbelt, Md., said on June 14 at the 220th Meeting of the American Astronomical Society.

Stapelfeldt and a team led by John Krist of the Jet Propulsion Laboratory in Pasadena, Calif., used the Hubble Space Telescope to study 10 stars suspected of hosting large debris disks. Hubble  saw a ring around only one, HD 202862, which resides near the southern constellations Grus and Microscopium.

Everything about the dusty circle — the biggest ever observed around a solar cousin — is huge. In places, the ring itself is 70 times wider than the Earth-sun distance, called an astronomical unit. From end to end, the debris disk is roughly 400 astronomical units long — larger than the well-known ring surrounding the star Fomalhaut. Like that ring, the newly observed one is also groomed by a celestial gardener — the planet lives about 140 astronomical units from HD 202862.

This planet hasn’t yet been observed, but Stapelfeldt speculates that it might be several times more massive than Jupiter. “You can’t get a structure like this, and have it last for a long period of time, unless something keeps all the particles’ orbits lined up,” he said.

Such distantly orbiting planets challenge theories describing planet formation, especially around sunlike stars. Debris disks around these stars don’t contain enough material to grow a planet so far away. “The formation of wide-orbit planets is particularly not well-understood,” says astrophysicist Aaron Boley of the University of Florida, who studies the Fomalhaut system and its far-flung ringscaping planets.  “To build a complete understanding of planet formation, we must understand the architecture of planetary systems, which includes planets that are at very large stellar separations.”

Both Boley and Kr

ist’s team suggest that the planet living around HD 202682 may have formed closer to the star, then migrated outward. But, Stapelfeldt says, that process would have had to be unusually gentle. “If you did something violent and you threw the planet out there, its gravity would tear up the ring,” he said. “You wouldn’t expect to have something like this left over.”

Source: Science News /  Nadia Drake

Entertainment

Ben Affleck Directs and Stars in Gruesome Gangster Saga

    Live by Night Blu-ray Review by Kam Williams Ben Affleck Directs and Stars in Gruesome Gangster Saga    Dennis Lehane has enjoyed phenomenal success not only as a novelist but writing directly for TV (Boardwalk Empire and The Wire). And several of his crime thrillers have been brought to the big screen, including Mystic River, Shutter Island and Gone, Baby, Gone. In 2007, Ben Affleck directed Gone, Baby, Gone, staying behind … [Read More its Good for You.....]

Books

The President’s Kitchen Cabinet

  The President's Kitchen Cabinet The Story of the African-Americans Who Have Fed Our First Families, from the Washingtons to the Obamas by Adrian Miller University of North Carolina Press Hardcover, $30.00 292 pages, Illustrated ISBN: 978-1-4696-3253-7 Book Review by Kam Williams “[This opus] vividly tells the stories of the African-Americans who worked in the presidential food service as chefs, personal cooks, butlers, stewards … [Read More its Good for You...]

Art

The Day After the Day Of

  The Day After the Day Of by Paul Ilechko   The sky sheds its tears. This morning is the morning of the day after. The day of mourning, the day after the day of.  I beseech the sky to shed tears in order to wash away the tears on my face.   This is the first day of the time after. This is the beginning of a new time, the days of pain, the days of sorrow. We are in mourning. The sky looks down and sheds its tears for … [Read More its Good For You...]

Real Estate

History Being Sold to the Highest Bidder

  History Being Sold to the Highest Bidder by Amy Lignor   For the longest time, scientists and archaeologists have been confused and bemused by various discoveries they’ve unearthed that offer little or no explanation as to the who, what, and why of the people who created these things or left them behind. Even now, in 2017, there are discoveries being studied; stories that were once legends now have actual bits of proof being found that … [Read More its Good for You.....]

Lifestyle

2017 Hobbies That Bring You Serenity

  2017 Hobbies That Bring You Serenity by Amy Lignor   Origami. Memory albums. Quilting. What do these have in common? Well, at one point or another in time, they have represented the “hottest” hobbies in the United States. Taking up hobbies are not only a fun thing to do for the “artistic/creative” type, but they also help to reduce stress. Even the AMA has cited the fact that taking up a hobby can produce a calming environment … [Read More its Good for You...]

Outdoors

Skeeter SX210

  Skeeter SX210 By Craig Lamb After buying a bay boat, why spend more time and money getting it rigged out for your needs? With the Skeeter SX210, you get a boat already factory rigged with the standard accessories and features serious anglers want in a bay boat. Best of all, you get the extras, dependability, and durability that make it a Skeeter for an affordable price. Affordable doesn’t mean any corners were cut. That’s not the … [Read More its Good for You...]

Sports

Will NASCAR Theatrics Bring Back Viewers?

  Will NASCAR Theatrics Bring Back Viewers? by Amy Lignor   For any of the millions who once watched ABC’s Wide World of Sports and heard the words “the thrill of victory and the agony of defeat,” they remember the footage of a skier’s crash when it came to the “agony” side of things. Everyone knew that sight was a fact – a video that was absolutely real. Nowadays, however, it seems that more and more sports are “making up” shots that … [Read More its Good for You...]

Business

How Are Retail Sales in 2017?

  How Are Retail Sales in 2017? E-Commerce Reigns by Amy Lignor   Despite consumer uncertainty, as well as a very sluggish beginning to 2017, the U.S. retail sales industry is projected to increase 4% this year. Headlines show that many retailers and companies posted “soft” holiday sales to end 2016, which caused some notable retailers to either cut jobs or close stores as a result. However, when it comes to 2017, the National … [Read More its Good for You...]

Travel

Where to Vacation? Go Big or Stay Home!

  Where to Vacation? Go Big or Stay Home! by Amy Lignor   We speak about luxury vacations, budget vacations, vacations that are fun for the kids, and many more areas of travel at this time of year. But there is also a category that many do not touch upon because they “assume” it is far too difficult for those on a budget to be able to enjoy these jaw-dropping wonders. However, whether you are a backpacker looking to “become a … [Read More its Good for You...]

Green Living

Creating the Perfect Vegetable Garden

  Creating the Perfect Vegetable Garden by Amy Lignor   Many are still dealing with that wintery mix Mother Nature just loves to toss down from the sky this time of year. Yet, that gardener living inside the soul – the one just dreaming of the sunny skies and lazy rainy days that are must-haves in order to grow the best vegetables possible – is already jotting down the facts, tricks and tips they need to know in order to make that … [Read More its Good for You...]