Asteroids coming our way

Discussion in 'Astronomy, Exobiology, & Cosmology' started by Michael 345, Feb 14, 2021.

  1. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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  3. RainbowSingularity Valued Senior Member

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    4Ld is close for a civilisation ender
    would not wipe ALL humans out
    but would wipe out a good 7 to 8 billion with little trouble over a year as everyone died of starvation
    would be very violent & terrible as humans wiped themselves out in a war for food & water
     
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  5. RainbowSingularity Valued Senior Member

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    several scientists have said publicly that roughly speaking a 1 kilometer wide asteroid at average speed would create global nuclear winter
    which in turn would wipe out billions in food shortages and weather conditions.

    depending on where it landed it would have different effects
    landing on land it would send out massive amounts of flaming rock over many kilometers where it would start massive wild fires

    on sea it would create significant tsunamis which would simply wipe many citys off the map, including the fact most human civilization concentrates around waters edge.

    what has occurred to me is the random chance of a 1LD object which strikes the moon could bounce pieces off at earth
    that would be difficult to track
    i expect none of the majority of wold leaders would release the information & they would run for their bunkers & watch it unfold on TV.

    when in reality
    do-able right now
    is a global joint missile & satellite defense system combining china usa russia & private contractors to have a multi pronged defensive layering system on alert.

    however
    the people who make all those decisions think they will be safe in their bunkers so they dont care about anyone else.
    they have no personal imperative to create the response to protect other peoples lives like they would their own.
     
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  7. DaveC426913 Valued Senior Member

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    This is how far away the asteroid is approx. to-scale with Earth and Moon. One pixel is approx. 1000 miles. (I've line-wrapped it but its really one long line.)

    o--------- --------- --------- --------- .
    Earth--------- --------- --------- -Moon

    --------- --------- --------- ---------

    --------- --------- --------- ---------

    --------- --------- --------- ---------

    --------- --------- --------- ---------.
    -------- --------- --------- -------Flyby
     
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  8. DaveC426913 Valued Senior Member

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    What is this distance unit "Ld"?

    It can't be light-day, since that distance encompasses the entire solar system, including the Kuiper Belt.
     
  9. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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    My question about 2 Kilometres being a close call was in regard to how much Earth gravity would have on the asteroid at such distance?
    That is ignoring all the permutations inherent within the rest of the planets in the solar system
    Would any effect (can it be calculated) result in the asteroid having a nearer of further flyby in the future?
    How far in the future?

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  10. James R Just this guy, you know? Staff Member

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    That's only about 5 times as far away as the Moon. Peanuts to space.

    Is has an effect at all distances, but the force decreases as the inverse square of the distance (as per Newton's law of gravity).

    It can be calculated. No doubt whichever organisation(s) are in charge of tracking near-Earth have calculated it. The effect could be either: nearer or further next time around.

    It depends on the details of the orbit.
     
  11. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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    I know that. But at its current distance will Earth gravity move it 2 cm or 2 km?

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  12. James R Just this guy, you know? Staff Member

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    It's more a matter of by what angle the orbit is diverted from the path it would have followed if the Earth hadn't been nearby. Orbital perturbations can be very small, but still add up to huge effects going into the future. A tiny push now might mean the difference between a near-miss and a collision with Earth a few hundred years down the track.
     
  13. DaveC426913 Valued Senior Member

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    And note (Michael) that there's no reason to assume that the subsequent flyby is closer or a bigger danger, as opposed to a farther, smaller danger.
    The possible future paths that are less hazardous far exceed the possible future paths that are more hazardous.
     
  14. RainbowSingularity Valued Senior Member

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    i checked & jpl neo list it as 5.1 LD
    keeping in mind they simply cant see some things coming & you see them suddenly appear only a day or so out a lot closer
     
    Last edited: Feb 15, 2021
  15. RainbowSingularity Valued Senior Member

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    https://www.bbc.com/news/av/world-56068503

    Meteor lights up Melbourne skies
    Meteor lights up Melbourne skies
    People have captured video of a meteor dramatically disintegrating in the skies above Melbourne, Australia.

    The celestial spectacle occurred on Valentine's Day, during the city's five-day lockdown.
    Published
    BBC News
    Subsection
    Australia
     
  16. Michael 345 New year. PRESENT is 72 years oldl Valued Senior Member

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    Expanded to add some items of interest which were crashed by Earth Minions on to the Moon surface



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  17. pluto2 Banned Valued Senior Member

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    I think that humans deserve to be wiped out by something eventually. Also the sooner it happens the better.

    Because lets face it: Humans are a shitty species and we love to make life miserable for one another and we are also extremely greedy and many humans also take great joy in seeing another human suffer hardships and misery in life so we deserve what's coming to us eventually.

    Humans have lost their innocence a long time ago so we deserve to be wiped out eventually.
     
  18. DaveC426913 Valued Senior Member

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    Obligatory sh*tpost by pluto2 about how the entire human race is evil and should die:

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  19. billvon Valued Senior Member

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    You are assuming all people are like you. They're not.
     

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