Archive Pages Design$type=blogging

Asteroids Could Present Big Problems For Our Future, Even Without an Impact

It’s no secret that asteroids may often contain significant quantities of precious metals. In fact, by some measures, it’s reasonable to co...

>

It’s no secret that asteroids may often contain significant quantities of precious metals. In fact, by some measures, it’s reasonable to conclude that much of Earth’s private stock of valuable metals–especially tungsten–actually came from past impacts where space objects collided with the Earth. Hence, many conclude that the future business prospects of mining asteroids in space for their valuable metallic stock are promising.

That is if the next asteroid that collides with Earth doesn’t destroy all life as we know it first.

While this statement may sound alarmist, it is a very legitimate concern, and one that must be dealt with for two primary reasons: 1) such impacts have occurred in the past, and will inevitably occur again, and 2) some past impact events have caused widespread devastation, and even mass extinctions.

However, direct impacts aren’t even necessary for there to be widespread devastation. Despite this, it could be argued that the most alarming thing about asteroids and their potential dangers is that humanity is still massively under-equipped for dealing with such a threat.

The Guardian recently reported on a meteor airburst over the Bering Sea which occurred in late 2018, which went largely unnoticed due to its remote location. Despite this, the meteor unleashed an estimated 10 times as much energy as the atomic blasts that leveled Hiroshima and Nagasaki at the end of World War II.

“The fireball tore across the sky off Russia’s Kamchatka peninsula on 18 December,” The Guardian reports, “and released energy equivalent to 173 kilotons of TNT. It was the largest air blast since another meteor hurtled into the atmosphere over Chelyabinsk, in Russia’s south-west, six years ago, and the second largest in the past 30 years.”

At the time of the Chelyabinsk event, NASA and other space agencies had been observing the passing of another space object near Earth, an asteroid called 2012 DA14, which flew as near as 28,000 km from Earth as it passed. Most evidence points to the two events being unrelated (although it is worth noting that one aerospace expert who I spoke with on conditions of anonymity at the time told me he found it hard to believe that the two events were entirely unrelated).

Whether or not the events were related, many raised the question as to why, if one object was already being tracked by NASA, there had been no advance warning of the Chelyabinsk meteor. Writing for Skeptical Inquirer in 2013, David Morrison, Alan Harris, and Mark Boslough noted that, “With a diameter of [about] twenty meters… the Chelyabinsk impactor was smaller than most asteroids that have been detected by the telescopes of the NASA Spaceguard Survey, which focuses on finding asteroids of about one hundred meters or larger.”

Of course, it wouldn’t necessarily require a space object 100 meters or larger to cause widespread devastation. Perhaps the best evidence for this is the famous Tunguska incident of 1908, which involved an object that was estimated to have been a mere 120 feet across, and which managed to destroy 800 square miles of forest in remote Siberia, flattening 80 million trees, according to data from NASA.

As noted at the space agency’s website:

“It is estimated the asteroid entered Earth’s atmosphere traveling at a speed of about 33,500 miles per hour. During its quick plunge, the 220-million-pound space rock heated the air surrounding it to 44,500 degrees Fahrenheit. At 7:17 a.m. (local Siberia time), at a height of about 28,000 feet, the combination of pressure and heat caused the asteroid to fragment and annihilate itself, producing a fireball and releasing energy equivalent to about 185 Hiroshima bombs.”

Flattened trees visible in the aftermath of the Tunguska event.

Along with the fact that asteroids smaller than those in the range of easy detection can be devastating is the fact that they can’t easily be destroyed. Charles El Mir, Ph.D of Johns Hopkins University’s Department of Mechanical Engineering described the problem in a recent paper, where he and his colleagues found that previous computer models used to determine how easily an asteroid would break were outdated. By employing a new computer model known as a Tonge-Ramesh model (named in part for one of his colleagues, K.T. Ramesh, who is director of the Hopkins Extreme Materials Institute), the group succeeded in calculating more detailed processes which determine what happens when an asteroid collides with another object.

“We used to believe that the larger the object, the more easily it would break, because bigger objects are more likely to have flaws,” El Mir wrote. “Our findings, however, show that asteroids are stronger than we used to think and require more energy to be completely shattered.”

Not that anyone ever said that it would be easy to destroy a potentially deadly asteroid, of course, although knowing just how resilient they can be isn’t very comforting. Fortunately, what is comforting is that of the detectable asteroid threats presently known to NASA, none pose any direct dangers to Earth within the next century.

So at very least, we may have some time to work on these problems before any Armageddon-style events become an imminent threat. Nonetheless, the evidence shows that even smaller asteroids–whether or not they ever collide directly with Earth–can also be problematic. The time to act is now if we hope to develop reliable methods of detecting and intercepting asteroids and other space objects that may pose a danger to the future of humankind.



from Mysterious Universe https://ift.tt/2CsuWms

COMMENTS

Loading...
Name

Âm Nhạc Ẩm Thực Angela Phương Trinh Angelina Jolie Bảo Thy benh-gan Bộ Ảnh - Video Brad Pitt Bùa Ngải Bước Nhảy Hoàn Vũ cac-benh-ve-gan Cao Thái Sơn Chi Pu Chuyện chỉ có ở Trung Quốc Chuyện kỳ lạ về trẻ em Chuyện Lạ Chuyện lạ bốn phương chọn lọc Chuyện lạ cảm động về các loài vật Chuyện lạ khó tin nhưng lại có thật Chuyện lạ ở Nhật Bản Chuyện lạ thế giới khó tin nhưng có thật Chuyện lạ về các loài vật Chuyện lạ về các tài năng hiếm có Chuyện lạ về chó và mèo Chuyện lạ về du lịch Chuyện lạ về hôn nhân - vợ chồng Chuyện lạ về những kỷ lục giảm cân Chuyện lạ về sữa Chuyện lạ Việt Nam có thật Cine Cộng Đồng Mạng Công Nghệ Cung Hoàng Đạo Cường Đô La Đàm Vĩnh Hưng Đàn Ông Đặng Thu Thảo dang-mieng Đĩa Bay Diễm My 9x Điện Ảnh Diệp Lâm Anh Đỗ Mạnh Cường Đời Sống doi-song Đông Nhi Đồng Tính Động Vật Du Lịch Đức Phúc fashion Gay Giảm cân Giáo Dục Giới Trẻ Hồ Ngọc Hà Hoa Hậu Hòa Minzy Hoài Linh Hoàng Thùy Linh Học Tiếng Anh hoc-duong Hot News HotNews Hương Giang Idol Hương Tràm Huỳnh Hiểu Minh Issac Jennifer Phạm Jessica Minh Anh Kenbi Khánh Phạm Khám Phá kham-pha Khánh Hiền Khmer News khoa-hoc khoa-hoc-cong-nghe Khoảnh Khắc Lan Khuê Lazada Lê Xuân Tiền Lều Phương Anh Linh Nga Lý Hải Mai Phương Thúy Maria Ozawa Mẹo Vặt Midu Minh Hằng Miu Lê Món ngon mỗi ngày Mọt Phim Musik Mỹ Linh Mỹ Tâm News Ngô Kiến Huy Ngọc Trinh Người ngoài hành tinh Nhật Kim Anh Những chuyện kỳ quặc trên thế giới Những hiện tượng bí ẩn và khó hiểu Những người có khả năng đặc biệt Noo Phước Thịnh Ốc Thanh Vân oto-xe-may Phạm Băng Băng Phạm Hương Phẫu Thuật Thẩm Mỹ Phong cách Phượng Channel Pokémon Go Quang Dũng Sao Shopping Sĩ Thanh Sơn Tùng M-TP sport Star Sức Khỏe suc-khoe suc-khoe-gioi-tinh Tâm Linh Tâm Sự Tăng Thanh Hà Taylor Swift Thanh Hằng Thành Lộc Thanh Thảo The Face - Gương mặt thương hiệu Thể Hình The Remix – Hòa Âm Ánh Sáng the-gioi Thời Trang Thu Minh Thu Phương Thượng Ẩn Thúy Nga Tin Nổi Bật Tin Nóng Tin Thế Giới Tin Trong Nước Tình Yêu Tom Cruise Trà Ngọc Hằng Trấn Thành Trường Giang Trương Nam Thành Tử Vi tv-show UFO Ung Thư Video Việt Hương Vietnam's Next Top Model Vĩnh Thụy Võ Cảnh Võ Hoàng Yến Vũ Khắc Tiệp Vũ Ngọc Anh Vũ Ngọc Đãng xa-hoi xe xo-gan Xu Hướng - Làm Đẹp
false
ltr
item
GIẢI TRÍ SAO 24H: Asteroids Could Present Big Problems For Our Future, Even Without an Impact
Asteroids Could Present Big Problems For Our Future, Even Without an Impact
https://mysteriousuniverse.org/wp-content/uploads/2019/03/meteor-643x440.png
GIẢI TRÍ SAO 24H
https://www.giaitrisao24h.com/2019/03/asteroids-could-present-big-problems.html
https://www.giaitrisao24h.com/
https://www.giaitrisao24h.com/
https://www.giaitrisao24h.com/2019/03/asteroids-could-present-big-problems.html
true
5412201294335186192
UTF-8
Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All BÀI CÙNG CHỦ ĐỀ LABEL ARCHIVE SEARCH Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago