Orionid Meteor Shower -- Today
ORIONID METEOR SHOWER--TODAY! Earth is passing through a stream of debris from Halley's Comet, source of the annual Orionid meteor shower. Forecasters expect ~25 meteors per hour when the shower peaks on Oct. 21st. No matter where you live, the best time to look is during the dark hours before sunrise on Sunday morning. Observers in both hemispheres can see this shower.
Viewing info: Orionids
Attention Gold Diggers!
Super-Earth Planet Likely Made of Diamond
by Clara Moskowitz, SPACE.com Assistant Managing Editor
Date: 11 October 2012 Time: 10:28 AM ET
Source: Space.com
Move over, Hope Diamond. The most famous gems on Earth have new competition in the form of a planet made largely of diamond, astronomers say.
The alien planet, a so-called "super-Earth," is called 55 Cancri e and was discovered in 2004 around a nearby star in our Milky Way galaxy. After estimating the planet's mass and radius, and studying its host star's composition, scientists now say the rocky world is composed mainly of carbon (in the form of diamond and graphite), as well as iron, silicon carbide, and potentially silicates.
Illustration of the interior of 55 Cancri e — an extremely hot planet with a surface of mostly graphite surrounding a thick layer of diamond, below which is a layer of silicon-based minerals and a molten iron core at the center.
CREDIT: Haven Giguere
At least a third of the planet's mass is likely pure diamond.
"This is our first glimpse of a rocky world with a fundamentally different chemistry from Earth," lead researcher Nikku Madhusudhan of Yale University said in a statement. "The surface of this planet is likely covered in graphite and diamond rather than water and granite."
55 Cancri e is the first likely "diamond planet" to be identified around a sun-like star, though such worlds have been theorized before. Planets like this are vastly different from our Earth, which has relatively little carbon.
"By contrast, Earth’s interior is rich in oxygen, but extremely poor in carbon — less than a part in thousand by mass," said study co-author and Yale geophysicist Kanani Lee.
55 Cancri e is what's known as a super-Earth, with a radius twice as wide as that of our own planet, and a mass eight times greater. It speeds around its host star, making a full orbit in just 18 hours (Earth takes 365 days). It is so close in to the star that its surface temperature reaches a scorching 3,900 degrees Fahrenheit (2,100 degrees Celsius), making it probably way too hot for life.
Previous studies of this planet suggested it might actually be covered with oozing "supercritical fluids" — high-pressure liquid-like gases — seeping out from its rocks. But this idea was based on the assumption that 55 Cancri e had a similar chemical makeup as Earth, Madhusudhan said. The new findings suggest the planet has no water at all.
The revelation of the planet's diamond nature means that it could have very different thermal evolution and plate tectonics processes than Earth, which could create bizarre types of volcanism, seismic activity, and mountain formation.
55 Cancri e is one of five planets encircling a sun-like star called 55 Cancri, which lies about 40 light-years from Earth in the constellation of Cancer. This star is so close it is visible to the naked eye in the night sky.
The researchers hope to make follow-up observations of this star system to better determine the star's composition and to analyze 55 Cancri e's atmosphere. This information could bolster the idea that the planet is a diamond world.
A paper reporting the new findings has been accepted for publication in the journal Astrophysical Journal Letters.
Dragon Chases the ISS
You can see them play tag yourself by entering your location info here.
[Blog author's viewing tip for ISS: Choose your viewing location and find the correct area of the horizon 5-10 minutes before viewing charts indicate the craft is visible. It moves *very* quickly, and looks like a high-flying jet.]
SpaceX's Dragon capsule launched Sunday (Oct. 7) on the first-ever bona fide commercial cargo run to the International Space Station, and skywatchers in parts of North America will be able to watch it chase down the orbiting lab over the next few nights.
On Monday and Tuesday (Oct. 8 and 9), the unmanned Dragon capsule and the space station will be visible as separate entities, appearing as "stars" sailing across the evening’s twilight sky. On Wednesday (Oct. 10) at 7:32 a.m. EDT (1132 GMT), the station's robotic arm will grapple Dragon and attach it a connecting port. So by Wednesday evening, both spacecraft will appear as a single bright moving "star."
The space station makes one full circuit of the Earth every 91.5 minutes. Shortly after launching atop a Falcon 9 rocket from Florida's Cape Canaveral Air Force Station at 8:35 p.m. EDT Sunday (0035 Monday GMT), Dragon trailed the orbiting lab by about 10 minutes.
More of this article may be found at How to See SpaceX's Dragon Capsule in the Night Sky
