Create: 2021-03-10 Update: 2025-07-02 01:51:40

📡 #رصد_کیهان: ۱۵ 🔗| عصر تاریک در حدود ۳۷۰ هزار سال پس از #بیگ_بنگ:

جریانِ فوتون‌ها (ذراتِ بی‌جرمِ تشکیل دهندهٔ نور 🔗) نیز شروع شد. برای اولین بار در کیهان، نور جریان پیدا کرد. اما ساختارهای کیهانی همچون ستاره‌ها و کهکشان‌ها هنوز شکل نگرفته بودند که منبع نور باشند. این عصر که از حدود ۳۷۰ هزار سال پس از بیگ بنگ شروع شد، به عصر تاریک معروف است. اطلاعات دربارهٔ عصر تاریک بسیار محدود است چرا که ستاره‌ها هنوز شکل نگرفته بودند.

با ادامهٔ کاهش دمای کیهان طی این دوره، اثر گرانش و تجمع مواد و گازها و غباراتِ کیهانی، اولین ستاره‌ها و کهکشان‌ها از حدود ۴۰۰ تا ۷۰۰ میلیون سال پس از بیگ بنگ شکل گرفتند که پایانی بود بر عصر تاریک. — 🌐 — [پست قبل: 🔗، پست اولِ این سری: 🔗]

دربارهٔ مادهٔ تاریک: 🔗

دربارهٔ انرژی تاریک: 🔗

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Should You Buy Bitcoin?

In general, many financial experts support their clients’ desire to buy cryptocurrency, but they don’t recommend it unless clients express interest. “The biggest concern for us is if someone wants to invest in crypto and the investment they choose doesn’t do well, and then all of a sudden they can’t send their kids to college,” says Ian Harvey, a certified financial planner (CFP) in New York City. “Then it wasn’t worth the risk.” The speculative nature of cryptocurrency leads some planners to recommend it for clients’ “side” investments. “Some call it a Vegas account,” says Scott Hammel, a CFP in Dallas. “Let’s keep this away from our real long-term perspective, make sure it doesn’t become too large a portion of your portfolio.” In a very real sense, Bitcoin is like a single stock, and advisors wouldn’t recommend putting a sizable part of your portfolio into any one company. At most, planners suggest putting no more than 1% to 10% into Bitcoin if you’re passionate about it. “If it was one stock, you would never allocate any significant portion of your portfolio to it,” Hammel says.

📡 #رصد_کیهان: ۱۵ 🔗| عصر تاریک در حدود ۳۷۰ هزار سال پس از #بیگ_بنگ:

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