Connect with us

Science

NASA boosts impact risk from 'potentially hazardous' asteroid Bennu – Yahoo Movies Canada

Published

 on


NASA boosts impact risk from ‘potentially hazardous’ asteroid Bennu

Potentially hazardous asteroid Bennu just became slightly more potentially dangerous.

Over a century from now, in 2135, a half-kilometre-wide asteroid named 101955 Bennu will pass between the Earth and the Moon. While there is absolutely no chance of an impact with Bennu at that time, the close encounter throws uncertainty into the predictions. As a result, there’s no saying for sure that Earth will be safe from Bennu afterward.

Before NASA sent their OSIRIS-REx spacecraft to Bennu, astronomers tracked asteroid Bennu using telescopes. Their observations gave us very accurate calculations of Bennu’s orbit. The relatively close passes of Bennu in 1999, 2005 and 2011 helped with this. Although it was officially classified as a “Potentially Hazardous Asteroid” (PHA), NASA could rule out any possibility of a Bennu impact for the next 100+ years.

However, the September 2135 encounter added an extra complication. The asteroid comes very close to Earth at that time. On September 24 of that year, its absolute minimum distance could be around 110,000 km from the planet’s surface or less than one-third the distance to the Moon. As it flies past, it will encounter one of several ‘gravitational keyholes’. As it passes through one of these tiny points in space, Earth’s gravity will tug on the asteroid and alter its orbit around the Sun.

Bennu Sept 2135 keyholes - NASA/GoddardBennu Sept 2135 keyholes - NASA/Goddard

Bennu Sept 2135 keyholes – NASA/Goddard

This screenshot of an animation used during the NASA press briefing on Wednesday, August 11, 2021, shows the potential paths of Bennu during the 2135 flyby, based on the most up-to-date telescope observations, with a separate ‘gravitational keyhole’ for each path. Credit: NASA/Goddard

Even with the carefully plotted orbit of Bennu, the minor uncertainties made it challenging to tell which ‘keyhole’ it would pass through during that 2135 flyby. Thus, there was no way to know with any certainty which orbit it would end up on afterward.

This was of great concern to scientists because it introduced over 150 possible impacts, with a cumulative 1 in 2,700 impact chance between 2135 and 2300. The most likely impact would be on September 24, 2182.

Bennu Sept 2182 potential impact - NASA/GoddardBennu Sept 2182 potential impact - NASA/Goddard

Bennu Sept 2182 potential impact – NASA/Goddard

The effects of one particular ‘gravitational keyhole’ could have disastrous results in 2182. Credit: NASA/Goddard

With OSIRIS-REx following along with the asteroid for over two years, though, it gave scientists an unprecedented chance to closely track the influence of the Yarkovsky effect.

The Yarkovsky effect is a tiny, constant ‘push’ that an asteroid receives as it radiates heat into space.

Watch below: How the Sun pushes asteroids around the solar system

Click here to view the video

According to Davide Farnocchia from the Center for Near Earth Object Studies (CNEOS) at NASA’s Jet Propulsion Lab, who is the lead author of a new study published this week, the force of this ‘push’ on Bennu is equivalent to about the weight of three grapes.

“Think about that, just three grapes,” Farnocchia said in a NASA teleconference on Wednesday. “Because this acceleration is persistent, its effect builds up over time, and it becomes very significant by the time we get to 2135.”

“The OSIRIS-REx data give us so much more precise information, we can test the limits of our models and calculate the future trajectory of Bennu to a very high degree of certainty through 2135,” Farnocchia said in a NASA press release. “We’ve never modelled an asteroid’s trajectory to this precision before.”

Based on their study of the Yarkovsky effect on Bennu, Farnocchia and his colleagues calculated an updated cumulative probability of a Bennu impact between 2135 and 2200. Instead of 1 in 2,700, the chance is now just 1 in 1,750. The individual chance of an impact on September 24, 2182, is now 1 in 2,700.

It should be noted that these probabilities are tiny.

A 1 in 1,750 chance is equal to a 0.057 per cent impact probability, while 1 in 2,700 is equivalent to 0.037 per cent. That means there’s over a 99.94 per cent chance that Bennu will miss Earth on all the potential encounters it has towards the end of the 22nd century. Specifically for September 2182, there’s a 99.96 per cent chance of a miss.

During their research, Farnocchia and the others accounted for every conceivable force that could affect Bennu’s orbit. They even considered whether the Touch-and-Go (TAG) maneuver that netted NASA a sample of the asteroid was enough to alter its trajectory.

Watch below: NASA’s OSIRIS-REx tags asteroid Bennu

Click here to view the video

“The force exerted on Bennu’s surface during the TAG event were tiny even in comparison to the effects of other small forces considered,” Rich Burns, OSIRIS-REx project manager at NASA’s Goddard Space Flight Center, said in the press release. “TAG did not alter Bennu’s likelihood of impacting Earth.”

The next steps in determining Bennu’s true potential as a threat to Earth will come in 2023 and 2037.

In 2023, OSIRIS-REx will swing past Earth. On its way past, it will drop off the sample it collected from Bennu’s surface back in the Fall of 2020. As scientists examine these samples in the laboratory, we will learn more about Bennu’s composition. This might provide information about how we could deflect such an asteroid on an impact trajectory.

In 2037, Bennu will be making its next close (but safe) flyby past Earth. During this pass, radio telescopes can gather radar data on the asteroid. These readings will help confirm the calculations made based on OSIRIS-REx’s data and give us an even better estimate of its exact path for that 2135 encounter.

Adblock test (Why?)



Source link

Continue Reading

Science

Tom Cruise gets sneak preview from SpaceX’s 1st private crew – Red Deer Advocate – Flipboard

Published

 on


.css-hm2vyzdisplay:inline-block;padding:4px 8px;font-family:’FaktCondensed’,AvenirNextCondensed-Medium,’Segoe UI’,sans-serif;font-weight:600;font-size:12px;text-transform:uppercase;-webkit-text-decoration:none;text-decoration:none;border:none;background:#f52828;color:var(–color–text-primary-reverse);font-size:14px;padding:8px;.css-hm2vyz::beforecontent:”#”;display:inline-block;.css-hm2vyz:hover,.css-hm2vyz:focus-webkit-filter:brightness(0.9);filter:brightness(0.9);color:var(–color–text-primary-reverse);.css-hm2vyz:activebox-shadow:inset -1px 2px 1px rgba(var(–color–static-black), 0.2);color:rgba(var(–color–text-primary-reverse), 0.8);.css-hm2vyz::beforemargin-right:4px;color:#fff;-webkit-filter:brightness(0.8);filter:brightness(0.8);Porsche

Porsche 928 From ‘Risky Business’ Sold For Way More Than We Expected

Motor1.com US – Jacob Oliva • 9h

A quick search for a living Porsche 928 up for auction will show examples with current bids around the $20,000 mark. But this particular example …

Adblock test (Why?)



Source link

Continue Reading

Science

Elon Musk mocks President Biden after SpaceX completes first all-civilian mission – CNBC

Published

 on


SpaceX CEO Elon Musk poses with the crew before launch on September 15, 2021.
John Kraus / Inspiration4

After SpaceX completed a historic, private spaceflight on Saturday, CEO Elon Musk took a pot shot at President Joe Biden who had yet to remark on the company’s and the civilian flight crew’s accomplishments.

One of Musk’s 60 million followers on the social networking platform Twitter asked him, “The President of the United States has refused to even acknowledge the 4 newest American astronauts who helped raise hundreds of millions of dollars for St. Jude. What’s your theory on why that is?”

Musk replied, “He’s still sleeping.”

As CNBC previously reported, SpaceX safely returned its Crew Dragon spacecraft from orbit yesterday. The capsule carried the four members of the Inspiration4 mission back to Earth after three days in space.

One major goal of the Inspiration4 mission was to raise $200 million for St. Jude Children’s Research Hospital. It had raised $160.2 million by Saturday. Celebrating after Inspiration4 splashed down, Musk pledged to contribute $50 million personally — pushing the campaign’s total raised to $210 million.

The White House and SpaceX did not immediately respond to a request for comment.

Top NASA officials have congratulated Musk and SpaceX on the Inspiration4 mission. SpaceX competitors acknowledged it too, with accolades from Boeing, Lockheed Martin, Blue Origin and Musk’s peer and rival Jeff Bezos shared on social media.

This marked the first private SpaceX spaceflight, with a non-professional crew. Additionally, the mission involved the first Black woman to serve as a spacecraft pilot, the youngest American to become an astronaut to date, and the first person to fly in space with a prosthesis.

Although Musk recently stated that he “would prefer to stay out of politics,” his quip on Sunday indicated a willingness to needle the Democratic president and repeat a right-wing taunt about Biden.

During his 2020 campaign, former President Donald Trump frequently insulted then-candidate Biden by calling him “Sleepy Joe.”

More recently, Trump sent Biden sarcastic well-wishes ahead of a summit with Russian President Vladimir Putin in June. He said in an e-mailed statement at the time, “Good luck to Biden in dealing with President Putin— don’t fall asleep during the meeting, and please give him my warmest regards!”

SpaceX generally enjoys a good relationship with the federal government. For example, it won a $2.89 billion contract to build NASA’s next crewed lunar lander, beating out Jeff Bezos’ Blue Origin and Leidos subsidiary Dynetics, and SpaceX has flown 10 astronauts to the ISS for NASA to date. 

However, SpaceX is also under investigation by the Department of Justice after accusations that it discriminated against job applicants based on citizenship status — a probe that began during the Trump administration.

In addition to his responsibilities at SpaceX, Musk is concurrently the CEO of electric vehicle makers Tesla. (Tesla is also a supplier to SpaceX.)

In that capacity, he recently bemoaned a Biden administration proposal that would allocate an extra $4,500 in incentives to buyers of certain, new electric light-duty passenger vehicles. One stipulation of the proposal is that electric vehicles should be union-made, domestically.

While the company operates a battery factory in Nevada, and a vehicle assembly plant in California already, with another under construction outside of Austin, Texas, Tesla is the only major U.S. automaker whose production is not unionized here.

Musk said, on Twitter on September 12, of the proposal: “This is written by Ford/UAW lobbyists, as they make their electric car in Mexico. Not obvious how this serves American taxpayers.”

In Cars.com’s annual American Made Index for 2021, Tesla’s popular Model 3 electric sedan topped the rankings, and its crossover Model Y landed in third place.

Adblock test (Why?)



Source link

Continue Reading

Science

SpaceX tourists chatted with Tom Cruise from space – Vaughan Today

Published

 on



space tourists fly Currently orbiting the Earth aboard the SpaceX spacecraft discussed with Famous actor Tom Cruise From space, the mission’s account announced Friday.

It will also be streamed live on Youtube at approximately 9 PM GMT (5 PM on the US East Coast), for ” Evaluate their multi-day trip SpaceX announced in a tweet.

Tom Cruise soon in space?

« Rook, Nova, Hanks, and Leo spoke to Tom Cruise today The official Inspiration4 mission account tweeted earlier, using the nicknames of the first four special passengers to fly. with SpaceX.

The tweet said they “shared their experience from space” with the actor. ” Maverick, you can be our ward whenever you want. Maverick is the name of the elite pilot that he embodies Tom Cruise in the movie Best.

Last year, former NASA administrator under Donald Trump, Jim Bridenstine, announced a lightweight film project, starring Tom Cruise, On board the International Space Station.

However, no details have been provided at the moment about the project, which should be done in cooperation with SpaceX.

The four Inspiration4 passengers – billionaire Jared Isaacman and three other Americans – took off Wednesday night from Florida. They are currently flying farther from the International Space Station, and the mission is scheduled to last three days in total.

“Proud thinker. Tv fanatic. Communicator. Evil student. Food junkie. Passionate coffee geek. Award-winning alcohol advocate.”

Adblock test (Why?)



Source link

Continue Reading

Trending