Archive for the ‘asteroid/comet impacts’ category: Page 11

Mar 4, 2022

When did the first humans arise on planet Earth?

Posted by in categories: asteroid/comet impacts, existential risks, genetics

By the time our planet was four billion years old, the rise of large plants and animals was just beginning. Complexity exploded around that time, as the combination of multicellularity, sexual reproduction, and other genetic advances brought about the Cambrian explosion. Many evolutionary changes occurred over the next 500 million years, with extinction events and selection pressures paving the way for new forms of life to arise and develop.

65 million years ago, a catastrophic asteroid strike wiped out not only the dinosaurs, but practically every animal weighing over 25 kg (excepting leatherback sea turtles and some crocodiles). This was Earth’s most recent great mass extinction, and it left a large number of niches unfilled in its wake. Mammals rose to prominence in the aftermath, with the first humans arising less than 1 million years ago. Here’s our story.

Mar 3, 2022

Pulverizing Asteroids Could Be Humanity’s Only Chance to Survive an Incoming Space Rock on Short Notice

Posted by in categories: asteroid/comet impacts, existential risks

A planetary scientist is working on a pulverizing system to destroy asteroids before they hit Earth. Learn more about his technology through this article.

Mar 3, 2022

The Rise and Fall of the Riskiest Asteroid in a Decade — “I’ve Never Seen Such a Risky Object”

Posted by in categories: asteroid/comet impacts, existential risks

For a few tense days this January, a roughly 70-meter asteroid became the riskiest observed in over a decade. Despite the Moon’s attempt to scupper observations, the asteroid is now known to be entirely safe.

Initial observations of an asteroid dubbed ‘2022 AE1’ showed a potential Earth impact on July 4, 2023 – not enough time to attempt deflection and large enough to do real damage to a local area should it strike.

Worryingly, the chance of impact appeared to increase based on the first seven days of observations, followed by a dramatic week ‘in the dark’ as the full Moon outshone the potential impactor, ruling out further observations. As the Moon moved aside, the skies dimmed and ESA’s Near-Earth Object Coordination Centre (NEOCC) took another look, only to find the chance of impact was dramatically falling.

Feb 23, 2022

‘Frozen in place’ fossils reveal dinosaur-killing asteroid struck in spring

Posted by in categories: asteroid/comet impacts, existential risks

Clues to the season of impact lingered in delicate fish fossils.

Around 66 million years ago, springtime in the Northern Hemisphere brought disaster and mass death to Earth in the form of a giant asteroid impact that triggered a global extinction.

Feb 21, 2022

Iawn: IAWN Home

Posted by in categories: asteroid/comet impacts, existential risks, habitats

This group appears to be doing its ‘bit’ for NEO identification and is always open to new members, check it out?

IAWN was established (2013) as a result of the UN-endorsed recommendations for an international response to a potential NEO impact threat, to create an international group of organizations involved in detecting, tracking, and characterizing NEOs. The IAWN is tasked with developing a strategy using well-defined communication plans and protocols to assist Governments in the analysis of asteroid impact consequences and in the planning of mitigation responses.

Feb 14, 2022

What Happened to Asteroid After It Wiped Out Dinosaurs

Posted by in categories: asteroid/comet impacts, existential risks

Read more

Feb 4, 2022

How safe is Earth from an asteroid impact? (2013) | 60 Minutes Archive

Posted by in categories: asteroid/comet impacts, existential risks

NASA says an asteroid came within about 1.2 million miles of the Earth’s atmosphere on Tuesday afternoon. In 2013, Anderson Cooper reported on our ability to detect asteroids and comets that come close to Earth after another asteroid impacted the atmosphere over Russia.

“60 Minutes” is the most successful television broadcast in history. Offering hard-hitting investigative reports, interviews, feature segments and profiles of people in the news, the broadcast began in 1968 and is still a hit, over 50 seasons later, regularly making Nielsen’s Top 10.

Continue reading “How safe is Earth from an asteroid impact? (2013) | 60 Minutes Archive” »

Feb 1, 2022

Humanity Could Survive A ’Planet-Killer’ Asteroid, A New Study Says

Posted by in categories: asteroid/comet impacts, existential risks, physics

About 66 million years ago, a “planet killer” — a 10-kilometer-wide rocky asteroid — hit Earth. The Chicxulub impact caused a mass extinction on a planetary scale, killing off an estimated 76 percent of all species living on Earth at the time, including the dinosaurs. According to a study published by Philip Lubin and Alexander N. Cohen, both physicists at the University of California in Santa Barbara, there is a chance that humanity could survive such a similar impact happening in the near future.

There currently are about 1,200 asteroids on a publicly available asteroid risk list, but all are smaller than one kilometer. The probability of a Chicxulub sized asteroid (5 to 15 kilometers across) hitting Earth is once in a billion years — very low, but not impossible.

Jan 24, 2022

Is the Sun expanding? Will it ever explode? (Beginner)

Posted by in categories: asteroid/comet impacts, climatology, Elon Musk, existential risks, sustainability

It’s wild.

A global apocalypse could be closer than you think.

According to astronomers, in five billion years or so, the sun will run out of hydrogen in its core completely and expand, possibly engulfing the earth. Now that’s a bright future you don’t want. SpaceX CEO Elon Musk recently tweeted that the expansion of the Sun would result in the extinction of all life on the planet, making interplanetary living a necessity. Musk said this in response to a paper warning about mass extinction caused by human activity, arguing for the necessity of working on ways to move off-world. However, while we lack the technology to live on other worlds just yet, we may have a more immediate catastrophe at hand — climate change and global warming. a preprint that has not yet been peer-reviewed, Sohrab Rahvar, proposes using gravity assist by the asteroids to change the orbit of the Earth.

Jan 22, 2022

SpaceX Starlink: Why humanity needs to act now before it’s too late

Posted by in categories: asteroid/comet impacts, existential risks, internet, satellites

We will soon need to make some difficult choices.

Given current trends, that number will be reached within a year or so. There are ways to mitigate the effect of these streaks. Painting the satellites and adding reflective panels could reduce their brightness, particularly at infrared wavelengths that are important for near-Earth asteroid detection.

But the study points out that the mitigation strategy currently proposed by Starlink won’t be sufficient to avoid an impact on astronomy.

Continue reading “SpaceX Starlink: Why humanity needs to act now before it’s too late” »

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