انجمن علمی ستاره‌شناسى | United States America (US)

Create: 2024-01-28 Update: 2025-07-02 05:55:42

خورشید تنها ستاره منظومه ما، منبعِ اصلی انرژی و حیات در سیاره زمین است. 🌱

🔺 این دوزخِ متلاطم 99.9 درصد کل جرم سامانه خورشیدی را دربردارد و خوشبختانه سیاره ما در فاصله مناسبی (یک واحد نجومی یا 8.3 دقیقه نوری) از آن قرار دارد.
💥 در مرکز این کرهء داغِ پلاسما، دما حدود 15 میلیون کلوین و فشار یک میلیارد اتمسفر است! در چنین محیطی همجوشی هسته‌ای(که منشأ انرژی عظیم خورشید است) انجام می‌شود.

☀️ لکه‌های خورشیدی مناطق موقتی روی سطحِ خورشید هستند که بخاطر سردتر بودن نسبت به نواحی اطراف، کم‌نورتر دیده می‌شوند.
هنگام رصدِ خورشید بصورت مرئی (با فیلتر مناسب و ایمن❗️) لکه‌ها به راحتی قابل رؤیت هستند.
🧲 اختلالات مغناطیسی ناشی از چرخشِ افتراقی خورشید، موجب جلوگیری از انتقالِ گرما شده و لکه‌ها را شکل می‌دهند. تعداد این لکه‌ها طِی دوره حدوداً 11 ساله‌ای به‌نام «solar cycle» تکرار می‌شود.

🛰 برای مشاهده تصاویر روزانه ثبت شده از خورشید در طیف‌های مختلف، می‌توانید به سایت رصدخانه خورشیدی ناسا مراجعه کنید.

📚 منبع: کتاب نجوم دینامیکی - نشر دانشگاهی
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انجمن علمی ستاره‌شناسى

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انجمن علمی ستاره‌شناسى

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Telegram Be The Next Best SPAC

I have no inside knowledge of a potential stock listing of the popular anti-Whatsapp messaging app, Telegram. But I know this much, judging by most people I talk to, especially crypto investors, if Telegram ever went public, people would gobble it up. I know I would. I’m waiting for it. So is Sergei Sergienko, who claims he owns $800,000 of Telegram’s pre-initial coin offering (ICO) tokens. “If Telegram does a SPAC IPO, there would be demand for this issue. It would probably outstrip the interest we saw during the ICO. Why? Because as of right now Telegram looks like a liberal application that can accept anyone - right after WhatsApp and others have turn on the censorship,” he says.

خورشید تنها ستاره منظومه ما، منبعِ اصلی انرژی و حیات در سیاره زمین است. 🌱

انجمن علمی ستاره‌شناسى TG
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Telegram Updated: 2025-07-02 05:55:42

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