Glossary term: उल्कापिण्ड
Description: उल्कापिण्ड, मेटिओराइट (meteorite) ३० माइक्रोमिटरदेखि १ मिटरसम्मको आकार भएको ठोस ब्रह्माण्डीय पिण्ड हो जुन पृथ्वी वा अन्य खगोलीय पिण्डको वायुमण्डलबाट गुज्रिसकेपछि त्यस पिण्डको सतहमा खस्छ। कुनै वस्तुलाई उल्कापिण्ड भनेर तब मात्र वर्णन गरिन्छ जब त्यो पृथ्वी वा अन्य खगोलीय पिण्डको वायुमण्डलबाट गुज्रिसकेको हुन्छ। अन्तरग्रहीय अन्तरिक्षमा हुँदा र वायुमण्डलबाट गुज्रिरहेको बेला यसलाई मेटिओरोइड (meteoroid) भनेर चिनिन्छ। उल्का पिण्डले वायुमण्डलमा उत्पन्न गर्ने आघात तरंगले प्रकाश उत्सर्जन गर्दछ र यसलाई उल्का (meteor) को रूपमा अवलोकन गर्न सकिन्छ।
उल्कापिण्डहरू सामान्यतया ढुङ्गा, फलाम र ढुङ्गाको मिश्रण, वा फलामबाट बनेका हुन्छन्, जसमा उल्काको दृश्यसँग जोडिएका उल्कापिण्डका प्रकारहरू हेर्दा ढुङ्गे मेटिओराइट सबै भन्दा सामान्य हुन्छ। तथापि, ढुङ्गाका उल्कापिण्डहरू प्रायः पार्थिव चट्टानहरू जस्तै देखिन्छन् त्यसैले बेवास्ता गरिन सक्छ जसले गर्दा फलामका उल्कापिण्डहरू जमिनमा फेला पर्ने सबैभन्दा सामान्य प्रकारका उल्कापिण्ड बन्न पुग्छ। अन्टार्कटिका वा मरुभूमिहरूमा सजिलै संग छुट्टाउन सकिने अथवा पत्ता लगाउन सजिलो हुने भएकाले यी ठाउँहरू मा अधिकांश मात्रामा उल्कापिण्डहरू फेला पर्छन्।
फेला परेका अधिकांश उल्कापिण्डहरू केही ग्रामदेखि धेरै किलोग्रामसम्मको द्रव्यमान भएका हुन्छन्। पृथ्वी मा ज्ञात भएको सबैभन्दा ठूलो उल्कापिण्ड नामिबियामा अवस्थित होबा मेटिओराइट हो, जुन ६० टनभन्दा बढी वजन को रहेको छ। केही उल्कापिण्डहरू प्रभाव क्रेटर (impact crater) उत्पन्न गर्न पर्याप्त ठूला हुन सक्छन्। उल्कापिण्डहरूलाई तिनीहरू खसेको क्षेत्रको नाममा नामकरण गरिन्छ।
Related Terms:
See this term in other languages
Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
If you notice a factual or translation error in this glossary term or definition then please get in touch.
In Other Languages
- अरबिक: النيزك
- जर्मन: Meteoriten
- अंग्रेजी: Meteorite
- फ्रान्सेली: Météorites
- ईटालियन: Meteorite
- जापनिज: 隕石 (external link)
- ब्राजिली पुर्तगाली: Meteoritos
- सरल चिनि: 陨石
- प्राचिन चिनि: 隕石
Related Media
Iron Meteorite
Caption: This iron meteorite was originally found in Harriman, Tennessee, USA and is now held in the collection of the Smithsonian Natural History Museum, Washington DC, USA. The total mass of the meteorite was about 30kg. Here we see the interior after the meteorite was cut into pieces.
Iron meteorites are largely composed of an iron-nickel. They also often have a crystalline structure which manifests here as a series of crossing shiny straight lines known as a Widmanstätten pattern. This is thought to have formed as the meteoroid (the object that would eventually fall through the Earth's atmosphere as a meteor and land on the ground as a meteorite) cooled very slowly in the vacuum of space in the early solar system. This led to the growth of this crystalline structure.
Credit: Chuck Sutherland
credit link
License: PD Public Domain icons
Related Activities
Meteoroids, Meteors and Meteorites
astroEDU educational activity (links to astroEDU website) Description: Unveiling the mystery of "shooting stars": meteors, meteorites and meteroids
License: CC-BY-4.0 Creative Commons Attribution 4.0 International (CC BY 4.0) icons
Tags:
Geology
Age Ranges:
6-8
, 8-10
, 10-12
, 12-14
Education Level:
Middle School
, Primary
Areas of Learning:
Interactive Lecture
Costs:
Low Cost
Duration:
1 hour 30 mins
Group Size:
Group
Skills:
Analysing and interpreting data
, Asking questions
, Communicating information
, Engaging in argument from evidence
