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News – The Canadian Space spaces laser can & # 39; threatens the World



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BY THIS WORLD | What & # 39; s Up In Space – the most important news coming to Earth from space

Scott Sutherland
Meteorologists / Science Writer

Wednesday, 5 & # 39; December, 2018, 5:43 pm – Does & # 39; space & # 39; the OSIRIS-Rex space & # 39; NASA's finally f & # 39; Bennu, Canadian laser will now operate map & # 39; the immense asteroid, and begins mission can & # 39 ;, one day, help us to save the world.

On Monday 3 & # 39; December, after more than two years, traveling in & # 39; distance & # 39; over 2 billion kilometers of space, the OSIRIS-Rex space bed finally arrived at its destination – a large asteroid known as Bennu 101 955.

This is not a landing, Such as Insight mission of NASA, setting up – & # 39; Elysium Planitia & # 39; of & # 39; Mars 26 & # 39; in November. Instead, OSIRIS-Rex – short for OrIGIN, Spectral Iinterpretation, Rsource IIDENTIFICATION, Sequation – Regolith Formerplorer – drew and increased speed to & # 39; the asteroid Bennu, f & # 39; distance & # 39; 19 km & # 39; far from it.

Now, because it gives to the NASA first close look at this closely asteroid side of the Earth, the spacecraft is starting to plan its facial features in detail by & # 39 ; Canadian built laser.

Over the next year, OSIRIS-Rex will lead closest flyby of poles & # 39; Bennu, and eventually approaches close enough to collect surface samples of the asteroid, to jirritornawna, here on Earth.


The approach & # 39; OSIRIS-Rex for Bennu, 2.2 million km 17 & # 39; August 2018 to 65 km only 27 & # 39; in November. Credits: NASA & # 39; s Goddard Space Flight Center / University & # 39; Arizona

MAPPING OF LASER & # 39; asteroids

The Canadian contribution to the mission OSIRIS-Rex is a device known as OSIRIS-Rex Rex Laser Altimeter LASERIS or OLA.

OLA, which was provided to the mission by the Canadian Space Agency, is essentially a laser finder. It works the same as the radar, but instead breaks & # 39; radio waves & # 39; off target, using laser light.

As Bennu rotated under the spacecraft, OLA sweep the surface with & # 39; her two lasers, and record the time it takes the laser light to cover the distance to the target and back. As the laser light speed is constant, the OLA of the science team can & # 39; uses these measurements & # 39; time to have the exact distance between the spacecraft and the surface of the asteroid, allowing them to build a complete 3D map of the characteristics of the asteroid.

The scans from OLA are so fine that the resulting map will have a resolution of & # 39; about 7 centimeters per pixel, which is good enough to choose individual stones on the surface of the asteroid.



CLICK FOR GROWTH. Canadian Laser will make 3D map & # 39; asteroid and display the best place to sample OSIRIS-Rex mission of NASA. Credit: Canadian Space Agency

As shown in the graph & # 39; above, these lasers are of & # 39; high intensity. B & # 39; completely, the device uses power equivalent to a light bulb & # 39; 75W! This is very important than you think. Read below, why.

This part of the mission was not only provided by the Canadian Space Agency. It is being conducted by Canadian scientists, as well!

The leading scientist for OLA is Dr. Michael Daly & # 39; York University, with scientists & # 39; co-deputy Dr. Catherine Johnson, from the University & # 39; British Columbia, and Dr. Jeff Seabrook, who is also from the University & # 39; York.

WHY BY WAY BENNU?

If there is one object in space at the same time raised the most interest to scientists, and urged the cleanest news, given the senses in the tabloids, is the asteroid Bennu.

Discovered back in 1999, this rubble pile in the area & # 39; half a kilometer "currently occupies second place on the table of Sentry NASA Risk – the list of & # 39; asteroids potentially hazardous near-Earth being closely monitored, because there is at least a chance, albeit small, that can, at times, have an impact on the Earth.

This "distinction" also made it a priority to Bennu in the scientific community, but entered the asteroid in the media attention, so that resist periodically in & # 39; tabloids items, along with & # 39; news report our inevitable fate in & # 39; hand this object.

# 2 Why asteroid threatens much attention?

While higher asteroid on the list, called 29075 (1950 DA), is bigger and faster, and b & # 39; so cause a lot more damage in an impact, this object has only a specific potential meeting closely with world – 16 & # 39; March 2880. Bennu, on the other hand, makes slightly more compelling story when trying timpiedi threats & # 39; the asteroid from space.


This animation & # 39; Bennu was captured by the camera OSIRIS-Rex when space was at & # 39; distance & # 39; about 80 kilometers from the asteroid. This shows a complete rotation & # 39; Bennu, more than 4 hours and 18 minutes. Credit: Center of & # 39; Goddard Space Flight NASA / University & # 39; Arizona

Not only Bennu is large enough to cause significant damage if they hit us, but also pass a series of & # 39; contacts with the World, b & # 39; a meeting that cause the asteroid move closer to each subsequent meeting by close, resulting in & # 39; & # 39 total, 78 different potential impact between 2175 and 2199 years.

Note: Although this is somewhat alarming fact about Bennu, important thing to remember is that the most "likely" a & # 39; these potential impacts – 24 & # 39; September 2196 – has only chance & # 39; 0.0094 per cent hitting the Earth. Or, to put it another way, there is still a 99.9906 percent chance that they will lose! Even – cumulative the likely impact of the 78 events, plus, of & # 39; impact (or opportunity & # 39; 99.963 percent & # 39; missing only 0.037 per cent chance). So, we're not talking in & # 39; certainties, here, by any stretch of & # 39; imagination! It's just that, given x & # 39; a f & # 39; risk – possible spread destruction across the Earth's surface – even those odds are enough for NASA to take notice, and maybe do something about times.

It all starts in 2060, when the Bennu is set to fly past Earth in & # 39; & # 39 reasonable distance, about 750,000 km, or slightly less than twice the distance to the Moon. What is completely safe passage, but at that time, the severity of the World is expected to give Bennu little nudge, so when it comes back to the next-closest approach, 25 & # 39; September, 2135 , when the asteroid is known to flying with us inside the Moon's orbit, There is some uncertainty about exactly both inside the orbit of the Moon will be. Can & # 39; is about 300,000 km & # 39; away (about 80% of the distance to the Moon), or can & # 39; to close 100,000 km (less than 1/3 the distance to the Moon).

The 2135 pace is completely safe as well, by the way. M & # 39; there is no chance the asteroid hitting the Earth at that time, even if you are flying past us into the orbit of the Moon. The chance, however, depending on exactly how close Bennu bring us, which will fly through & # 39; what is known as & # 39; gravitational keyhole & # 39; – a small point in space, formed by the gravitational attraction between the Earth and Bennu, which can & # 39; cause significant change in orbit & # 39; the asteroid & # 39; forward.

If one fails Bennu from such tiny keys, the change in its orbit can & # 39; is sufficient to alter one of the potential impacts between 2175 and 2199 in & # 39; a real impact.

There are many uncertainties and & # 39; IFS & # 39; involved in the future & # 39; Bennu, but this is something that really help us OSIRIS-Rex us by resolving those uncertainties.

The primary space missions are to download Bennu and send home samples, but also to gather information to help us track the orbit of the asteroid b & # 39; more precisely, and you & # 39; give us knowledge that allows us to deviate the asteroid (and others like her), we need f & # 39; some point in the future.

PROTECTION OF TERRA

One way OSIRIS-Rex can & # 39; help protect the Earth from impacts is to examine how Bennu reacts to absorb sunlight and heat jradixxi from his face. Its rotation changed? Its orbit changed, even in the slightest?

These types of & # 39; changes are due to what's known as the "Yarkovsky effect".

Seeing in life & # 39; day, here on Earth, because there are too few forces to compete around (gravity, friction, air resistance), but any object that is emitting light experiencing & # 39; push & # 39 very weak; from every photon that leaves his face. This is known as pressure of radiation, and is caused by photon carrying the momentum it as leaving the object surface, which – due to the Third Law Newton – resulting in & # 39; response "equal and opposite ", adding the opposite direction the photon was emitted.

In space, & # 39; away from any significant competitive forces, this exchange & # 39; Momentum can & # 39; have a much greater effect, especially on items like rotating asteroid.

As an asteroid like Bennu absorbs solar radiation on of its sun side, and emits infrared photon from his face (ie heat), every bit of & # 39; momentum given to an asteroid by each photon actually leave "pushed "on the asteroid. Because it takes time to absorb solar radiation to get & # 39; is radiated as heat, most & # 39; drive & # 39; powerful photon arising from it by the parties & # 39; afternoon & # 39; & # 39 evening; the asteroid. B & # 39; In general, this leads to the object is & # 39; pushed & # 39; along the direction of & # 39; its orbit, as well & # 39; Sun away. So, over time, the orbit & # 39; slowly leave the Sun Bennu. If Bennu rotated in the opposite direction, has inspired & # 39; inward toward the sun.

See below to see the effect of & # 39; Yarkovksy in action, and how OSIRIS-Rex will help

So close to Bennu, OSIRIS-Rex can & # 39; followed by orbital accuracy of the asteroid and the rate of & # 39; rotation, to see how they may change over time.

The data the spacecraft return you & # 39; help us to develop methods to unlock Yarkovsky effect, and b & # 39; so that we can protect the Earth from threats & # 39; the asteroid.

Forget airplanes blowing with nuclear weapons, or send people (oil drillers?) To pump their bombs inside. Instead, deployable robotic spacecraft designed to change the way hazardous asteroid absorbs and emits light, since soar different materials on the surface, or by changing how much sunlight reaches the asteroid. Therefore, we are use the pressure principles of radiation and the effect of & # 39; Yarkovsky to our advantage, to the asteroid remove slow way of their impact trajectory and sailing us safe.

Sources: NASA | NASA | CSA

RELATED & # 39; BENNU AND BACK, BY SCIENCE @ NASA

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