Astronomers Find a Exoplanet Through a
Never-Before-Used Method (Source: Astronomy)
Astronomers find most exoplanets from indirect signals, noticing
changes in the light of the planet’s host star instead of by seeing the
planet itself. But some stars’ light changes all on its own, making
these methods tricky at best. KIC 7917485b is the first exoplanet
identified around a main sequence A-type star from its orbital motion,
and the first found near an A -typestar’s habitable zone.
A-type stars are bigger and hotter than most stars in the Kepler
catalog and tend to be noisy, changing brightness at regular intervals.
This dimming and brightening can be hard to untangle from, for
instance, a planet transiting and dimming its light. As such, while
there’s no reason for A-type stars not to have planets, it’s been
difficult for astronomers to identify them. So far, the few exoplanets
found around A-type stars are either from direct imaging (which can
only, where the planets are very far from their star, or from transits
where the planets are very close to the star, where the signal is
strong.
But astronomers came up with a novel idea to use the variability of the
star itself as a way to look for exoplanets. The star pulses because of
helium changes in its lower layers. It puffs up, cools and dims,
shrinks, heats and brightens, and then repeats the process multiple
times in a day. In a Kepler light curve, this shows up as a periodic
dimming and brightening, like clockwork. But this clock shows a delay.
The pulsations appear a little early or late, and by calculating this
delay, astronomers can measure that the star is actually moving in a
back-and-forth, orbital motion. And this movement is due to the
gravitational tug of a nearby planet. (12/4)
Pentagon Says Raytheon Making Progress
on GPS Satellite Control System (Source: Reuters)
Raytheon Co is making progress on a long-delayed program for new ground
control stations for next-generation GPS satellites, although it is
lagging a remedial schedule agreed with military officials, the
Pentagon's chief arms buyer said. "It's actually making progress," said
Defense Undersecretary Frank Kendall. (12/4)
Delaware Suit Targets $6.4B B/E
Aerospace-Rockwell Merger (Source: Law360)
B/E Aerospace Inc. stockholders on Thursday asked Delaware’s Chancery
Court to block or order reversal of the company’s $6.4 billion merger
with Rockwell Collins Inc., saying in a putative class claim that
inadequate disclosures about finances and insider benefits hobbled
efforts to judge the deal. (12/2)
If You're Looking For Alien Life, How
Will You Know If You've Found It? (Source: NPR)
When a robotic probe finally lands on a watery world like Jupiter's
moon Europa, what do scientists have to see to definitively say whether
the place has any life? That's the question retired astronaut John
Grunsfeld posed to some colleagues at NASA when he was in charge of the
agency's science missions.
"We looked at him with blank faces," recalls Jim Green, head of NASA's
planetary sciences division. "What do we need to build to really find
life? What are the instruments, what are the techniques, what are the
things that we should be looking for?" Click here.
(12/5)
Why Tech’s Biggest Billionaires Want
Their Place in Space (Source: Guardian)
a small band of billionaire technocrats have spent the past few years
investing hundreds of millions of dollars into space ventures. Forget
gilded mansions and super yachts; among the tech elite, space
exploration is the ultimate status symbol. Click here.
(12/5)
U.S. Posturing To Protect Space
Presence (Source: Aviation Week)
Classified space wargames have been used to pit U.S. forces against
what is called a “near-peer” competitor. But in the most recent
Schriever Wargame, which looks out 10 years into the future, the
exercise sees adversaries catching up. “We have realized that there
could be peers,” says Jason Altchek, executive director of the exercise.
The endeavor bolsters a shift in how the military and intelligence
community are organized and how they buy the assets they use to
operate. To defend space assets, President Barack Obama’s
administration is building “resilience” into future constellations
through increased outreach with allies and the private sector. And the
administration’s framework for resilience in space, grounded in
deterrence theory, is likely to outlast this presidency, said Winston
Beauchamp, the Pentagon’s principal space advisor, at a Defense One
Summit in November. (12/2)
How NASA and FEMA Will Deal with a
Killer Asteroid (Source: Mashable)
In the NASA plan to deal with a killer asteroid destroying the world,
the first people to learn about it likely find out via text message.
Seriously. If a killer asteroid on a path to striking Earth were
discovered, the first word of its existence would likely come in the
form of a text or an email—preliminary information about the space
rock, sent out to a group of less than 12 scientists.
At that stage, researchers wouldn't know much about the size and
trajectory of the errant space rock, but that'd change quickly. They'd
start hurriedly gathering observations of the object, likely first
spotted by one of the large survey telescopes constantly looking out
for this kind of thing. And then, they'd get to work. Click here.
(12/4)
Netflix A.I. Could Help NASA Search
for Exoplanets (Source: Inverse)
What do NASA and Netflix have in common? Probably more than you would
think. Researchers have developed a technique that uses artificial
intelligence to help them search for and identify stable planetary
systems. The technique is based on learning algorithms used by the
streaming giant to offer online recommendations. This new tool will be
used in tandem with NASA’s fleet of planet-hunting telescopes to
identify planets that could potentially support life.
“Machine learning offers a powerful way to tackle a problem in
astrophysics, and that’s predicting whether planetary systems are
stable,” Dan Tamayo, lead author of the research and a postdoctoral
fellow in the Center for Planetary Science at the University of Toronto
Scarborough, explained in a news release.
As a form of artificial intelligence, machine learning enables
computers to learn on their own, without having to be constantly fed
data or programmed for a specific task. These types of advanced systems
are specifically designed to learn and adapt on their own when exposed
to different data. Tamayo says the team’s technique is 1,000 times
faster than traditional methods in predicting stability. (12/4)
Plans to Restore NASA Mission Control
Room Remain in Limbo (Source: Waco Tribune)
Plans to restore the NASA mission control room that served as the nerve
center for the Apollo missions, when man first reached the moon, have
been discussed for more than 20 years, but its restoration and
preservation remain in limbo with no set date for work to begin.
Officials at Johnson Space Center in Houston say the restoration of
Mission Operation Control Room 2 is a priority, but note that NASA has
other priorities, too — including the space flights managed in the
large, active building where the control room is located. The room was
designated a National Historic Landmark in 1985 and retired seven years
later. (12/4)
Two More Fragments of Progress Cargo
Spacecraft Found in Siberia (Source: Tass)
Two more fragments of the Progress MS-04 cargo spacecraft have been
found in the Republic of Tyva in south Siberia, the republican
government’s press office told TASS on Monday. "Another small fragment
was found in the courtyard of a house in the village of Eilig-Khem,"
the press office quoted Tyva Head Sholban Kara-ool as saying.
According to him, another fragment was found in the same terrain near a
shepherd station. The faulty spacecraft’s first fragment was found on
Saturday 15 km from the village of Eilig-Khem in the area of Tos-Tevek
of the Ulug-Khemsky district. (12/5)
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