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Voiko joku selittää miten pilvi voi muodostua samaan paikkaan (2009, 2012, 2015 ja 2018), näyttää kuin se tulisi tulivuoresta, mutta ei viranomaisten mukaan ole tulivuoresta johtuva, vaan sisältää jääkiteitä planeetalla missä ei yleensä ole korkean ilmakehän pilviä taikka haihtumisesta johtuvia pilviä ylipäätänsä, please?

Since 13 September, ESA's Mars Express has been observing the evolution of an elongated cloud formation hovering in the vicinity of the 20 km-high Arsia Mons volcano, close to the planet's equator.

In spite of its location, this atmospheric feature is not linked to volcanic activity but is rather a water ice cloud driven by the influence of the volcano's leeward slope on the air flow - something that scientists call an orographic or lee cloud - and a regular phenomenon in this region.

The cloud can be seen in this view taken on 10 October by the Visual Monitoring Camera (VMC) on Mars Express - which has imaged it hundreds of times over the past few weeks - as the white, elongated feature extending 1500 km westward of Arsia Mons. As a comparison, the cone-shaped volcano has a diameter of about 250 km; a view of the region with labels is provided here.

Mars just experienced its northern hemisphere winter solstice on 16 October. In the months leading up to the solstice, most cloud activity disappears over big volcanoes like Arsia Mons; its summit is covered with clouds throughout the rest of the martian year.

However, a seasonally recurrent water ice cloud, like the one shown in this image, is known to form along the southwest flank of this volcano - it was previously observed by Mars Express and other missions in 2009, 2012 and 2015.

The cloud's appearance varies throughout the martian day, growing in length during local morning downwind of the volcano, almost parallel to the equator, and reaching such an impressive size that could make it visible even to telescopes on Earth.

The formation of water ice clouds is sensitive to the amount of dust present in the atmosphere. These images, obtained after the major dust storm that engulfed the entire planet in June and July, will provide important information on the effect of dust on the cloud development and on its variability throughout the year.

The elongated cloud hovering near Arsia Mons this year was also observed with the visible and near-infrared mapping spectrometer, OMEGA, and the High Resolution Stereo Camera (HRSC) on Mars Express, providing scientists with a variety of different data to study this phenomenon.
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http://www.marsdaily.com/reports/Mars_Express_keeps_an_eye_on_curious_cloud_999.html
 
ctg kirjoitti:
Voiko joku selittää miten pilvi voi muodostua samaan paikkaan (2009, 2012, 2015 ja 2018), näyttää kuin se tulisi tulivuoresta, mutta ei viranomaisten mukaan ole tulivuoresta johtuva, vaan sisältää jääkiteitä planeetalla missä ei yleensä ole korkean ilmakehän pilviä taikka haihtumisesta johtuvia pilviä ylipäätänsä, please?

http://www.marsdaily.com/reports/Mars_Express_keeps_an_eye_on_curious_cloud_999.html
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Siellä on jonkun jalostamon seisokki aina viiden (meikäläisittäin kolmen) vuoden välein. Ne vähän tupruttaa käynnisteltäessä.

Muoks taisin laskea väärite päin nuo ajanjaksot :(
 
Viimeksi muokattu:
NASA is asking for help making shipments to a future lunar space station 240,000 miles (almost 400,000 kilometers) away. The agency opened a solicitation this week asking companies to consider what they'd need to deliver cargo; United States firms have until Nov. 2 to provide their input.

The agency is designing its Lunar Orbital Platform-Gateway, a space station that is expected to orbit the moon and host astronauts beginning sometime in the mid-2020s. But the design work is starting now, to make sure the agency is ready and commercial partners are available.

Right now, NASA is looking for companies that would be interested in carrying both pressurized and unpressurized cargo, just like SpaceX's Dragon does for cargo missions to the International Space Station. NASA said it anticipates purchasing at least three cargo delivery missions; the first, tentatively scheduled for 2024, would likely include "a robotic arm provided by an international partner," the agency said in a statement. [Look Inside Lockheed Martin's Proposed Lunar Gateway Habitat]

NASA isn't ready to actually hire a contractor yet, as the agency is just looking for more information about who might be interested and what factors would influence its willingness and pricing, hence the short turnaround for this request.

The Gateway will still be under construction during the first two cargo missions, which means NASA is looking for a module that could pull double-duty: Once each module is docked to the station, it would serve as a handy storage space and eventually as a trash receptacle. NASA is also looking for cargo vessels that could launch both on commercial rockets, for the first two deliveries, and on its own huge moon rocket under construction, the Space Launch System — which will be tested in 2020 with a round-the-moon trip.

"As the agency moves humans deeper into the solar system with its partners, a spaceship in lunar orbit is necessary to achieve the ambitious exploration goals set forth by President Donald Trump and to prepare humanity for missions to the moon and Mars," NASA added in the same statement.
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https://www.space.com/42269-nasa-lunar-gateway-cargo-shipments.html
 
A Russian rocket that carried two people to space last month failed and sent the craft back to Earth because of "deformation" of a part that was made during assembly at the cosmodrome, a space official said Thursday.

"The cause of a non-standard separation (of the rocket's second stage)" was a "deformation" of a part during assembly at the Baikonur cosmodrome, said Oleg Skorobogatov who headed the Russian commission probing the accident.

He said this caused a booster rocket from the first stage to malfunction and hit a fuel tank which "led to the loss of stabilisation" and triggered an emergency landing.

The Russian-American crew of two had to withstand a ballistic descent back to Kazakhstan on October 11, but both emerged from their landing craft safe and sound.

Executive director of Russia's Roscosmos space agency Sergei Krikalyov said Wednesday that the root of the problem was a sensor that indicated the separation of the first two stages of the Soyuz rocket.

Skorobogatov, who heads TsNIIMash, a Russian research institute specialising in spacecraft and missile development, said the commission ruled out that the problem happened at a production facility.

Russia is the only country currently able to send astronauts to the International Space Station, and the accident caused it to suspend all launches until getting to the bottom of the rare failed manned launch.

However the safe descent to Earth by cosmonaut Aleksey Ovchinin and US astronaut Nick Hague led both Roscosmos and NASA to stand by the Soyuz system as reliable.

The Soyuz "remains the most reliable rocket," said Dmitry Baranov, the acting director of Russia's Energia rocket and space corporation.

Following the investigation by the space experts, "appropriate law enforcement authorities" will work out who is guilty of the assembly mistake, said Roscosmos deputy head Alexander Lopatin.

"Every accident has a name and surname (of the guilty party)," he said.
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http://www.spacedaily.com/reports/S...failure_of_stage_separation_detector_999.html
 
YliKoo kirjoitti:
Siellä on jonkun jalostamon seisokki aina viiden (meikäläisittäin kolmen) vuoden välein. Ne vähän tupruttaa käynnisteltäessä.

Muoks taisin laskea väärite päin nuo ajanjaksot :(
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