Archive for the ‘space’ category: Page 469
Jun 21, 2021
Scientists Built a Walking Mars Rover That Can Climb Steep Hills
Posted by Quinn Sena in categories: robotics/AI, space
Engineers from ETH Zurich in Switzerland and the Max Planck Institute in Germany built a small quadrupedal robot meant to leap around on the surface of the Moon, much like the Apollo astronauts did half a century ago.
Now SpaceBok, named after the bounding springbok antelope, is getting a Mars upgrade — on the Red Planet, it will have to weather much stronger gravity than on the Moon and face more treacherous terrain, as Wired reports.
The concept is a strong one. If it were to ever land on Mars, a walking robot could explore terrain that has so far been off limits to wheeled rovers — and maybe even the planet’s mysterious caves.
Jun 21, 2021
Tree-ring structure of Galactic bar resonance
Posted by Saúl Morales Rodriguéz in category: space
ABSTRACT. Galaxy models have long predicted that galactic bars slow down by losing angular momentum to their postulated dark haloes. When the bar slows down, resonance sweeps radially outwards through the galactic disc while growing in volume, thereby sequentially capturing new stars at its surface/separatrix. Since trapped stars conserve their action of libration, which measures the relative distance to the resonance centre, the order of capturing is preserved: the surface of the resonance is dominated by stars captured recently at large radius, while the core of the resonance is occupied by stars trapped early at small radius. The slow down of the bar thus results in a rising mean metallicity of trapped stars from the surface towards the centre of the resonance as the Galaxy’s metallicity declines towards large radii. This argument, when applied to Solar neighbourhood stars, allows a novel precision measurement of the bar’s current pattern speed |$\Omega _{\rm p}= 35.5 \pm 0.8 \, {\rm km}\, {\rm s}^{-1}\, {\rm kpc}^{-1}$|, placing the corotation radius at |$R_{\rm CR}= 6.6 \pm 0.2 \, {\rm kpc}$|. With this pattern speed, the corotation resonance precisely fits the Hercules stream in agreement with kinematics. Beyond corroborating the slow bar theory, this measurement manifests the deceleration of the bar of more than |$24{{\ \rm per\ cent}}$| since its formation and thus the angular momentum transfer to the dark halo by dynamical friction. The measurement therefore supports the existence of a standard dark-matter halo rather than alternative models of gravity.
Jun 21, 2021
“Being a Billionaire Is a Lot Harder Than It Looks”: Jeff Bezos and Elon Musk Want to Burn Their Cash in Space
Posted by Genevieve Klien in categories: Elon Musk, space
Welcome to the new space race, as the world’s richest men compete over who has the biggest rocket—and the ability to win lucrative contracts.
Jun 21, 2021
Indiana Jones in space: Inside the fascinating world of galactic archaeology
Posted by Atanas Atanasov in categories: physics, space
Astrophysicists now have the data and models to uncover subtle imprints from our galaxy’s past.
Jun 21, 2021
Evidence Found for Life on Enceladus?
Posted by Greg Allison in categories: food, habitats, space
Breaking — see how an overabundance of methane at Saturn’s ice moon Enceladus may be evidence for life there!
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Jun 21, 2021
HOW ON EARTH did China succeed in landing Zhurong rover on Mars? Review of CNSA deep space missions
Posted by Alberto Lao in category: space
As the first Mars rover probe launched by China, Tianwen-1 Zhurong rover has completed the three major technical steps of Mars exploration at one time. The three steps are Orbiting, landing, and patrolling, which are, entering Mars orbit, landing on the surface of Mars, and the rover walking and patrolling around. Why did China’s space agency successfully break the so-called “Mars curse” with its very first Mars rover landing mission? How did the various aerospace technologies involved in the Zhurong landing process develop?
Jun 20, 2021
Hubbles Main Computer Is Offline, And NASA Is Desperately Attempting to Fix It
Posted by Quinn Sena in categories: computing, space
The Hubble Space Telescope is currently offline.
On Sunday 13 June, the telescope’s payload computer went offline, and engineers here on Earth are currently performing operations to get it up and running again.
The payload computer, as you might expect, is vital to Hubble’s continued science operations. It’s the ‘brains’ of the instrument, coordinating and controlling the various instruments with which Hubble is equipped. It also monitors the telescope for issues.
Jun 20, 2021
Space agencies are learning how to make food on Mars and the moon
Posted by Genevieve Klien in categories: Elon Musk, food, robotics/AI, space, sustainability
As Elon Musk and Jeff Bezos rocket companies lead a new space race, NASA is working on AI and robotics to farm space plants and feed interplanetary humans.
Jun 20, 2021
Astronomers Find a Blinking Star Near the Center of the Milky Way
Posted by Genevieve Klien in category: space
In this week’s edition of new unexplained astronomical phenomena, a team of astronomers led by Dr. Leigh Smith from Cambridge found a star 100 times larger than our sun that nearly disappears from the sky every few decades. They also have no idea why it does so.
The star, called VVV-WIT-08, is located 25000 light years away, and decreases in brightness by a factor of 30 rather than disappearing altogether. It’s not the first star to be discovered with this changing brightness pattern, but evidence is beginning to mount that this might just be another example of a new class of stars.
VVV-WIT-08’s name itself is calling out for an explanation. The “WIT” in the middle actually stands for “what is this”, which is what astronomers call stars that are difficult to classify into any particular established category.