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Cosmos In Brief - Aktualní novinky vesmírného výzkumu v kostce
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VIRGO --- 22:22:17 30.6.2015
Telescopes focus on target of ESA’s asteroid mission / Asteroid Impact Mission / Space Engineering & Technology / Our Activities / ESA
Telescopes around the globe recently homed in on one point in the sky, observing the paired Didymos asteroids – the target for ESA’s
proposed Asteroid Impact Mission. The 800 m-diameter main body is orbited by a 170 m moon, informally dubbed Didymoon. The duo were more
favourably placed from March until early June for studies. The goal was to help with planning not only ESA’s Asteroid Impact Mission (AIM)
but also the NASA-led Double Asteroid Redirection Test, or DART, which will crash into Didymoon in late 2022 as ESA’s craft looks on.
The two candidate missions together are known as the Asteroid Impact & Deflection Assessment (AIDA) mission.
The very best observations turned out to be from Flagstaff, Arizona, USA – part of the observatory that famously discovered Pluto back
in 1930 – as the conditions proved optimal there.

VIRGO --- 22:09:38 30.6.2015
Dnes přidáváme sekundu!


Rok 2015 bude o sekundu delší | Ostatní | Články | Astronomický informační server astro.cz

NASA explains why June 30 will get extra second

'Leap second': Why June 30 will have one extra second - LA Times

Strictly speaking, a day lasts 86,400 seconds. That is the case, according to the time standard that people use in their daily lives—Coordinated
Universal Time, or UTC. UTC is "atomic time"—the duration of one second is based on extremely predictable electromagnetic transitions in atoms
of cesium. These transitions are so reliable that the cesium clock is accurate to one second in 1,400,000 years.
However, the mean solar day—the average length of a day, based on how long it takes Earth to rotate—is about 86,400.002 seconds long. That's because
Earth's rotation is gradually slowing down a bit, due to a kind of braking force caused by the gravitational tug of war between Earth, the moon and
the sun. Scientists estimate that the mean solar day hasn't been 86,400 seconds long since the year 1820 or so.
This difference of 2 milliseconds, or two thousandths of a second—far less than the blink of an eye—hardly seems noticeable at first. But if this
small discrepancy were repeated every day for an entire year, it would add up to almost a second. In reality, that's not quite what happens.
Although Earth's rotation is slowing down on average, the length of each individual day varies in an unpredictable way.
VIRGO --- 22:04:38 30.6.2015
Global Star Party Episode 5 June 28 - Nimoy Asteroid, M8, Centaurus A

Astronomy Cast Ep. 383: Approaches to Absolute Zero
VIRGO --- 22:03:09 30.6.2015
Asteroid Awareness Day | The Museum of Flight
Asteroid Day Takes Aim at Our Cosmic Blind Spot: Threats From Above - NBC News


Join Slooh on Tuesday, June 30th, for a live broadcast as we help celebrate the first ever Asteroid Day on June 30, 2015.
Start Time: June 30th
3:00PM PDT/6:00PM EDT/22:00 UTC
Link: http://main.slooh.com/event/slooh-celebrates-asteroid-day-2015/

Conceived by musician and astrophysicist Brian May and filmmaker Grigorij Richters, Asteroid Day is a global awareness campaign to educate people about asteroids
and the actions we must take to keep our planet safe from dangerous asteroid impacts. Asteroid Day will be held on the anniversary of the famous Tunguska event
when a large asteroid or comet devastated a city-sized area in Siberia on June 30, 1908.As part of the Asteroid Day movement, the organizers of Asteroid Day created
the 100x Asteroid Day Declaration, a document which has been signed by more than one hundred astronauts, Nobel-Prize-winning scientists, business and technology
leaders, and artists from around the world. During our show on June 30, Slooh will interview some of these signatories including the entrepreneur and astronaut
Richard Garriott. We’ll discuss the importance of raising awareness of the risk posed to our planet by asteroids. We’ll show images of near-Earth asteroids captured
with Slooh telescopes including the asteroid 1566 Icarus which passed just 5 million miles from Earth on June 16, 2015. Our astronomers will also discuss
the science of close asteroid approaches and sort out fact from hype.

VIRGO --- 21:52:35 30.6.2015
Japan hatches plan to land probe on south pole of moon - AJW by The Asahi Shimbun
The science ministry plans to land an unmanned probe at the south pole of the moon in the early 2020s in an attempt to enhance Japan’s standing
in the space exploration business. Examination of rocks at the pole could provide clues to the origin of the moon, and there is also the chance
of water or ice being found that could be used for astronauts in future missions. “The plan is a top priority, and we should also weigh
cooperating with the United States in proceeding with the project,” the ministry said in a report compiled June 25 by a panel of experts.

VIRGO --- 21:45:57 30.6.2015
Bright Spots on Ceres: June 15, 2015 Image | NASA Dawn Mission
June 29, 2015: Here are the brightest spots in an underexposed image to bring out details. This image of dwarf planet Ceres,
taken by NASA's Dawn spacecraft on June 15, 2015, shows a cluster of mysterious spots that are clearly brighter than their surroundings.
Dawn took this image at an altitude of 2,700 miles (4,400 kilometers). The resolution is 1,400 feet (410 meters) per pixel.

VIRGO --- 21:44:38 30.6.2015
The PRIMA instrument for the VLT Interferometer is shown here during testing in Garching. The two combined beams of the PRIMA fringe sensor unit
(FSU) B are seen, in red metrology laserlight, joining the FSU’s beam combiner in the background to the fibre injection optics. When complete
the facility is expected to provide improvements in VLTI sensitivity, along with astrometry to better than 100 microarcseconds.
PRIMA-Testbed | ESO Česko

VIRGO --- 21:42:46 30.6.2015
Improved sensors help navigate gravity waves
Scientists are hoping to document these waves using the Laser Interferometer Gravitational-Wave Observatories (LIGO) in the United States
which comprise a pair of L-shaped vacuum systems, four kilometres long with mirrors at each end, along which laser beams are fired.
The theory behind LIGO is that a gravitational wave would affect each leg differently thereby creating a measurable change.
It began observing in 2002 but no gravitational waves were detected. Since it was first conceived a major rebuild called Advanced LIGO had
been planned that would increase sensitivity by more than a factor of ten, to the point where predicted signals would be detectable about
forty times per year.