‘Siti Killer’ or Asteroid? Kitne aate hai har saal prithvi ke pass
Asteroid Earth Ko Hit Karte Rehte Hai: Dosto, aaj hum baat karenge Dharati ke paas se har saal gujarne wale darawane asteroids ya ulkapindon ke bare mein. Inko toh hum ‘Siti Killer’, ‘Planet Killer’ ya Tabahi Ka Devta bolte hain. Aapko yaad hoga, kareeb 6 karod 50 lakh saal pehle, ek bada asteroid Dharati se takra gaya tha, jiske kaaran dinosaurs ki ab tak ki jeevan ka safar samaapt ho gaya tha!
Bentley: In asteroids ya ulkapindon ka saur mandal ke banne ke baad kaafi saare chattano ke tukde hote hain. Lagbhag aadha arab asteroids, jo ki chaar meter se adhik vyas wale hote hain, surya ke chaaron taraf se prithvi ki taraf badhte rehte hain, aur is safar mein unki gati lagbhag 30 kilometer prati second hoti hai, yani ki prithvi ke saman. Aise asteroids toh logo ki kalpanaon mein bade khatarnak hote hain, isliye unhein Hollywood films mein bhi kaafi baar dikhaya jata hai, jahaan par dikhaya jata hai ki agar koi bada grah Prithvi se takra gaya toh kitna bada vinash ho sakta hai. Aur hum toh aksar sunte hi rehte hain ki kshudragrahas like ‘bas’, ‘truck’, ‘vending machine’, ‘aadhe jiraf’, ya fir kabhi-kabhi ‘poore jiraf’ jaisa aakar hone ke wale kshudragrahas hamare paas se guzar jaate hain.
Humare Paas Hain Kuch Khaas Kshudragrahas: Dosto, hamare paas kuch vishesh kshudragrahas bhi hote hain, jaise ki ‘Siti Killer’, ‘Planet Killer’, ya ‘God of Chaos’. Inn kshudragraho se utpann khatre sach mein hote hain. Maana jata hai ki lagbhag chhah karod 50 lakh varsh pehle, ek bada kshudragrah Prithvi par takra gaya tha, jiske karan adhikansh dinosaurs ki jaan nikal gayi thi. Lekin humein nazar andaaz nahi karna chahiye, humein inn kshudragraho se bhi savdhaan rehna chahiye. Aap jaante hain, chhote kshudragrahas bade kshudragraho ki tulna mein kam nuksaan pahunchate hain. Isliye, Prithvi chhote kshudragrahas ke saath lagatar lekin kam prabhav wali takkaron ka samna karti hai, jabki bade kshudragrahas ke saath durlabh lekin uchch prabhav wali takkaron ka saamna karti hai.
Kitne Kshudragrahas Prithvi Ke Paas Se Gujarate Hain?
Sabse jyada mamle mein, sabse chhote kshudragrahas Prithvi ke vayumandal se takra kar toot jaate hain aur zameen par girte bhi nahi. Jab ek chhota kshudragrah (ya ulkapind) Prithvi ke vayumandal se takraata hai, toh yeh ek chamkila ‘aag ka gola’ banta hai, jise hum shooting star ya ulka kehte hain. Aur agar kuch tukde zameen par gir jaate hain, toh use ulkapind kaha jata hai. Lekin jyadatar vastuen vayumandal mein hi jal jaati hain. Aap soch rahe honge, kitne kshudragrahas Prithvi ke paas se takraate hain? Chaliye, ek bahut hi saral ganana se humein pata chal jayega ki aap kitne kshudragraho ke hamare grah ke kareeb aane ki umeed rakh sakte hain.
Aaiye, chaar-meter vyas wale kshudragrahas ka example lete hain. Prati varsh, ek baar, ausat mein, chaar meter ka kshudragrah Prithvi ki satah se takraata hai. Aap agar us satah kshetra ko doguna kar dein, toh aapko prati varsh do milenge. Prithvi ki trijya 6,400 kilometer hai, aur dogune satah kshetra-fal wale ek gole ki trijya 9,000 kilometer hoti hai. Toh, prati varsh lagbhag ek baar, chaar meter ka kshudragrah Prithvi ki satah ke 2,600 kilometer ke andar aata hai – matlab 9,000 kilometer aur 6,400 kilometer ke beech ka antar. Agar hum satah kshetra ko phir se doguna karein, toh aap Prithvi ki satah ke 6,400 kilometer ke andar prati varsh do se takra sakte hain, aur aage ka aakalan karte hue, isse kitne kshudragraho ke paas se guzarne ki umeed rakhi ja sakti hai. Toh, yeh haliya record ke saath kaafi milta julta hai. Lekin choti muthi vyas wale kshudragrahas ke liye kuch hajaar kilometer doori badi doori hai, lekin kuch aur bade kshudragrahas bahut zyada door se bhi guzar jaate hain.
Khagolshastra Mein ‘Nazdeeki’ Aur ‘Kareebi’: Dosto, khagolshastra ke anusaar, chandrama se kareeb 300,000 kilometer tak kisi bhi cheez ko ‘nazdeeki’ maana jaata hai. Lekin khagolshastrion ke liye ‘kareebi’ woh nahi hota jo hum aam taur par ‘kareebi’ samajhte hain. Hal hi mein, 2022 mein 126 asteroids ko hamare kareeb paya gaya tha, aur 2023 mein bhi hamare
