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2024 年 4 月 23 日

飞机凝结尾的X形影子
影像提供与版权: Fatih Ekmen

说明:这朵云上的庞大X形是怎么来的?它是飞机凝结尾受到下方阳光照射所投射的影子。当飞机航行时,引擎排放的潮湿废气,可在地球冰寒的高层大气凝结成水滴,并可进一步凝结成冰。这些滞留良久的线形水和冰迹,会散射上方的太阳光,因此从下方观看时显得相当明亮。然而在较罕见的情况下,当太阳位于地平线附近时,飞机凝结尾会受到下方的阳光照耀。这些凝结尾向上投射的颀长影子,除非遇到高层云,否则通常隐不可见。而这正是本月稍早,在土耳其伊斯坦堡上空所看到的景观。地球各地都能见到飞机的凝结尾,当它们吸收红外光时,会让地球变暖,但高效率反射阳光时,却能让地球降温。这幅影像是一位颇为惊讶的摄影者,摄于上班的途中。



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2024 年 4 月 23 日

飞机凝结尾的X形影子
影像提供与版权: Fatih Ekmen

说明:这朵云上的庞大X形是怎么来的?它是飞机凝结尾受到下方阳光照射所投射的影子。当飞机航行时,引擎排放的潮湿废气,可在地球冰寒的高层大气凝结成水滴,并可进一步凝结成冰。这些滞留良久的线形水和冰迹,会散射上方的太阳光,因此从下方观看时显得相当明亮。然而在较罕见的情况下,当太阳位于地平线附近时,飞机凝结尾会受到下方的阳光照耀。这些凝结尾向上投射的颀长影子,除非遇到高层云,否则通常隐不可见。而这正是本月稍早,在土耳其伊斯坦堡上空所看到的景观。地球各地都能见到飞机的凝结尾,当它们吸收红外光时,会让地球变暖,但高效率反射阳光时,却能让地球降温。这幅影像是一位颇为惊讶的摄影者,摄于上班的途中。

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NASA每日天文图片 APOD Telegram | DID YOU KNOW?

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What is Telegram?

Telegram’s stand out feature is its encryption scheme that keeps messages and media secure in transit. The scheme is known as MTProto and is based on 256-bit AES encryption, RSA encryption, and Diffie-Hellman key exchange. The result of this complicated and technical-sounding jargon? A messaging service that claims to keep your data safe.Why do we say claims? When dealing with security, you always want to leave room for scrutiny, and a few cryptography experts have criticized the system. Overall, any level of encryption is better than none, but a level of discretion should always be observed with any online connected system, even Telegram.

Export WhatsApp stickers to Telegram on Android

From the Files app, scroll down to Internal storage, and tap on WhatsApp. Once you’re there, go to Media and then WhatsApp Stickers. Don’t be surprised if you find a large number of files in that folder—it holds your personal collection of stickers and every one you’ve ever received. Even the bad ones.Tap the three dots in the top right corner of your screen to Select all. If you want to trim the fat and grab only the best of the best, this is the perfect time to do so: choose the ones you want to export by long-pressing one file to activate selection mode, and then tapping on the rest. Once you’re done, hit the Share button (that “less than”-like symbol at the top of your screen). If you have a big collection—more than 500 stickers, for example—it’s possible that nothing will happen when you tap the Share button. Be patient—your phone’s just struggling with a heavy load.On the menu that pops from the bottom of the screen, choose Telegram, and then select the chat named Saved messages. This is a chat only you can see, and it will serve as your sticker bank. Unlike WhatsApp, Telegram doesn’t store your favorite stickers in a quick-access reservoir right beside the typing field, but you’ll be able to snatch them out of your Saved messages chat and forward them to any of your Telegram contacts. This also means you won’t have a quick way to save incoming stickers like you did on WhatsApp, so you’ll have to forward them from one chat to the other.

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