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In photos: 20 shows you simply cannot miss at Expo 2020 Dubai

In photos: 20 shows you simply cannot miss at Expo 2020 Dubai
gulfnews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from gulfnews.com Daily Mail and Mail on Sunday newspapers.

New yorkUnited statesUnited arab emiratesGulf newsOrenburgskaya oblastSouth koreaHussain al jassmiJeoungyeol yuSam bompasParekh singhRagheb alamaNancy ajramMagnus carlsenKadim al sahirGabriel curtisIan nepomniachtchi

AM 1540 WBCO

AM 1540 WBCO
wbco.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from wbco.com Daily Mail and Mail on Sunday newspapers.

Crawford parkUnited statesSalem cemeteryCrawford countySandusky riverJakob boehlerWarren uxleyJonathan kaufmanCrawford park district book clubNature centerBook clubLowe volk park nature centerCrawford park district nature centerCrawford park astronomy clubOhio division of wildlifeSandusky river watershed coalition

Q92 7 WQEL

Q92 7 WQEL
wqel.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from wqel.com Daily Mail and Mail on Sunday newspapers.

Meet The New Manager Of The Planetarium At U-M Museum Of Natural History

Meet The New Manager Of The Planetarium At U-M Museum Of Natural History
wemu.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from wemu.org Daily Mail and Mail on Sunday newspapers.

United statesOlivet nazarene universityWestern michigan universityLisa barryMatthew linkeMatt linkeUniversity of michigan planetariumMichigan universityGreat lakes planetarium associationUniversity of michiganMichigan science centerMuseum of natural historyUniversity of michigan museum natural historyMichigan museumNatural historyMichigan planetarium

最热星的冷知识：温度3万度以上几万个太阳光度 - 科学探索 - cnBeta COM

通常，正常的恒星按其光谱特征被分为O、B、A、F、G、K、M型。这个分类序列也代表着一个温度序列，其中O型星温度最高，而M型星温度最低。随着观测技术的发展，最近人们发现了更冷的L和T型星，甚至还有最冷的Y型星。大多数人对恒星的认识，几乎都来自于常见的F、G、K型星，但作为最早的O型星，其质量一般要超过16个太阳质量，温度在3万度以上，光度至少是几万个太阳光度，与我们常见的F、G、K型星相比，O型星

Republic ofIt the officeChina academy country observatoryCommona divisionIntroduction lee china academy country observatorySun scienceOrion nebulaStar vietnamMilky wayChina academy country最热星的冷知识温度3万度以上几万个太阳光度குடியரசு ஆஃப்சூரியன் அறிவியல்ஒரையந் நெபுலாபால் வழி