user10967: Assume that the earth destroyed just a fraction of second as a result of massive meteoroid collision and there are only 10000 humans live at the moment. A one human being possess strong qualifications to get the rebirth as human again.(karmic effects,exact "chuthi citta" at the moment of death and etc....). So what happen next as there are no conditions to get the rebirth as human again? 

user111: Human realm is not the only realm of existence. There are 31 in total. Also, it doesn't say that earth is the only place in the universe where humans live. So the person could be born in another human realm or the closest thing to it.
In any case, it's a purely hypothetical situation. I doubt that a meteoroid can destroy the earth in fraction of a second. Someone will probably have to instantly place the earth on the sun or in a black hole for such a thing to  happen.

user10100: In A.N. Tikanipāta Cūḷanīsutta:


Cūlanikāsuttaṃ –– The thousandfold world system

Venerable Ānanda approached the Blessed One, worshipped, sat on a side and said to the Blessed One: Venerable sir, these words I heard
  from the Blessed One and are acknowledged by the Blessed One: Ānanda,
  Abhibhū, a disciple of the Blessed One Siki makes announcements to the
  thousandfold world systems at one and same time from the world of
  Brahma. Venerable sir, the Blessed One worthy and rightfully
  enlightened, making an announcement how far could you be heard?
Ānanda, he is a disciple of an immeasurable number of Thus Gone Ones.
For the second time venerable Ānanda said: Venerable sir, these words
  I heard from the Blessed One and are acknowledged by the Blessed One:
  Ānanda, Abhibhū, a disciple of the Blessed One Siki makes
  announcements to the thousandfold world systems at one and same time
  from the world of Brahma. Venerable sir, the Blessed One worthy and
  rightfully enlightened, making an announcement how far could you be
  heard?
Ānanda, he is a disciple of an immeasurable number of Thus Gone Ones.
For the third time venerable Ānanda said : Venerable sir, these words
  I heard from the Blessed One and are acknowledged by the Blessed One:
  Ānanda, Abhibhū, a disciple of the Blessed One Siki makes
  announcements to the thousandfold world systems at one and same time
  from the world of Brahma. Venerable sir, the Blessed One worthy and
  rightfully enlightened, making an announcement how far could you be
  heard?
Ānanda, have you heard of the Cūlanika thousandfold world system?
Venerable sir, Blessed One, Well Gone One, now is the time to hear it.
  The bhikkhus hearing it from the Blessed One will bear it .
Then Ānanda, listen and attend carefully, I will tell.
The Blessed One said: Ānanda, as long as the moon and sun illuminate
  the directions, till then the thousandfold world systems will prevail,
  with a thousand, moons, suns, Mahameru mountains, Indian peninsulars,
  Aparagoyanas, Uttarakurus, Pubhavidehas, fourfold oceans, fourfold
  rulers, fourfold guardian kings, heavens of the thirty-three, heavens
  of Titan gods, heavens of happiness, heavens of the gods of creation,
  heavens of the gods who create others, worlds of Brahma. Ānanda, to
  this is called the thousandfold Cūlanika world system. Ānanda, as long
  as the thousandfold Cūlanika world system prevails till then the
  thousandfold world system, calls this the two thousandfold middle
  world system. Ānanda, as long as the two thousandfold middle world
  element prevails till then the thousandfold world system calls this
  the three thousandfold and the great thousandfold world system.
  Ānanda, if the Thus Gone One desires, he announces to the three
  thousandfold and the great thousandfold world system.
Venerable sir, how does the Blessed One, if he desires announce to the
  three thousandfold and the great thousandfold world system?
Here Ānanda, the Thus Gone One pervades the three thousandfold and the
  great thousandfold world system with an effulgent light, so that those
  sentient beings see it, then the Thus Gone One makes a sound. In this
  manner an announcement is made to the three thousandfold and the great
  thousandfold world system if he desires.
When this was said venerable Ānanda said to venerable Udayi: It is
  great gain for me that my Teacher is so powerful.
When this was said venerable Udayi said: Friend Ānanda, what does it
  matter to you, when your Teacher is so powerful?
Udayi, do not say so. If Ānanda passes away without freeing his mind
  from greed, on account of that pleasant mind, he will be ruler of gods
  for a hundred times. In this same peninsular of India he will be the
  ruler. Yet Udayi Ānanda will extinguish in this same life.


10967: <p>Assume that the earth destroyed just a fraction of second as a result of massive meteoroid collision and there are only 10000 humans live at the moment. A one human being possess strong qualifications to get the rebirth as human again.(karmic effects,exact "chuthi citta" at the moment of death and etc....). So what happen next as there are no conditions to get the rebirth as human again? </p>
 111: <p>Human realm is not the only realm of existence. There are <a href="https://www.accesstoinsight.org/ptf/dhamma/sagga/loka.html" rel="nofollow noreferrer">31 in total</a>. Also, it doesn't say that earth is the only place in the universe where humans live. So the person could be born in another human realm or the closest thing to it.</p>

<p>In any case, it's a purely hypothetical situation. I doubt that a meteoroid can destroy the earth in fraction of a second. Someone will probably have to instantly place the earth on the sun or in a black hole for such a thing to  happen.</p>
 10100: <p>In A.N. Tikanipāta <a href="http://www.84000.org/tipitaka/pitaka_item/r.php?B=20&amp;A=5985&amp;w=%E2%C5%A1%B8%D2%B5%D8&amp;eng=metta_e" rel="nofollow noreferrer">Cūḷanīsutta</a>:</p>

<blockquote>
  <ol start="10">
  <li><strong>Cūlanikāsuttaṃ</strong> –– The thousandfold world system</li>
  </ol>
  
  <p>Venerable Ānanda approached the Blessed One, worshipped, sat on a side and said to the Blessed One: Venerable sir, these words I heard
  from the Blessed One and are acknowledged by the Blessed One: Ānanda,
  Abhibhū, a disciple of the Blessed One Siki makes announcements to the
  thousandfold world systems at one and same time from the world of
  Brahma. Venerable sir, the Blessed One worthy and rightfully
  enlightened, making an announcement how far could you be heard?</p>
  
  <p>Ānanda, he is a disciple of an immeasurable number of Thus Gone Ones.</p>
  
  <p>For the second time venerable Ānanda said: Venerable sir, these words
  I heard from the Blessed One and are acknowledged by the Blessed One:
  Ānanda, Abhibhū, a disciple of the Blessed One Siki makes
  announcements to the thousandfold world systems at one and same time
  from the world of Brahma. Venerable sir, the Blessed One worthy and
  rightfully enlightened, making an announcement how far could you be
  heard?</p>
  
  <p>Ānanda, he is a disciple of an immeasurable number of Thus Gone Ones.</p>
  
  <p>For the third time venerable Ānanda said : Venerable sir, these words
  I heard from the Blessed One and are acknowledged by the Blessed One:
  Ānanda, Abhibhū, a disciple of the Blessed One Siki makes
  announcements to the thousandfold world systems at one and same time
  from the world of Brahma. Venerable sir, the Blessed One worthy and
  rightfully enlightened, making an announcement how far could you be
  heard?</p>
  
  <p>Ānanda, have you heard of the Cūlanika thousandfold world system?</p>
  
  <p>Venerable sir, Blessed One, Well Gone One, now is the time to hear it.
  The bhikkhus hearing it from the Blessed One will bear it .</p>
  
  <p>Then Ānanda, listen and attend carefully, I will tell.</p>
  
  <p>The Blessed One said: Ānanda, as long as the moon and sun illuminate
  the directions, till then the thousandfold world systems will prevail,
  with a thousand, moons, suns, Mahameru mountains, Indian peninsulars,
  Aparagoyanas, Uttarakurus, Pubhavidehas, fourfold oceans, fourfold
  rulers, fourfold guardian kings, heavens of the thirty-three, heavens
  of Titan gods, heavens of happiness, heavens of the gods of creation,
  heavens of the gods who create others, worlds of Brahma. Ānanda, to
  this is called the thousandfold Cūlanika world system. Ānanda, as long
  as the thousandfold Cūlanika world system prevails till then the
  thousandfold world system, calls this the two thousandfold middle
  world system. Ānanda, as long as the two thousandfold middle world
  element prevails till then the thousandfold world system calls this
  the three thousandfold and the great thousandfold world system.
  Ānanda, if the Thus Gone One desires, he announces to the three
  thousandfold and the great thousandfold world system.</p>
  
  <p>Venerable sir, how does the Blessed One, if he desires announce to the
  three thousandfold and the great thousandfold world system?</p>
  
  <p>Here Ānanda, the Thus Gone One pervades the three thousandfold and the
  great thousandfold world system with an effulgent light, so that those
  sentient beings see it, then the Thus Gone One makes a sound. In this
  manner an announcement is made to the three thousandfold and the great
  thousandfold world system if he desires.</p>
  
  <p>When this was said venerable Ānanda said to venerable Udayi: It is
  great gain for me that my Teacher is so powerful.</p>
  
  <p>When this was said venerable Udayi said: Friend Ānanda, what does it
  matter to you, when your Teacher is so powerful?</p>
  
  <p>Udayi, do not say so. If Ānanda passes away without freeing his mind
  from greed, on account of that pleasant mind, he will be ruler of gods
  for a hundred times. In this same peninsular of India he will be the
  ruler. Yet Udayi Ānanda will extinguish in this same life.</p>
</blockquote>
