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研究表明靠近地球的超新星爆发可能导致了至少两次大规模灭绝事件。研究人员认为，分别发生在 3.72 亿年前和 4.45 亿年前的晚泥盆纪和奥陶纪灭绝事件是地球附近的超新星爆发导致的。奥陶纪灭绝事件杀死了 60% 的海洋无脊椎动物，当时的生命大部分生活在海洋里。晚泥盆纪灭绝事件杀死了 70% 的物种。科学家认为这两起灭绝事件与臭氧层损耗相关，而这可能是超新星引发的。研究人员称，这两次灭绝事件的时间与地球附近超新星爆发的频率一致。 DOI 10.1093/mnras/staf083 Eurekalert: Violent supernovae 'triggered at least two Earth extinctions'
研究表明靠近地球的超新星爆发可能导致了至少两次大规模灭绝事件。研究人员认为，分别发生在 3.72 亿年前和 4.45 亿年前的晚泥盆纪和奥陶纪灭绝事件是地球附近的超新星爆发导致的。奥陶纪灭绝事件杀死了 60% 的海洋无脊椎动物，当时的生命大部分生活在海洋里。晚泥盆纪灭绝事件杀死了 70% 的物种。科学家认为这两起灭绝事件与臭氧层损耗相关，而这可能是超新星引发的。研究人员称，这两次灭绝事件的时间与地球附近超新星爆发的频率一致。 DOI 10.1093/mnras/staf083 Eurekalert: Violent supernovae 'triggered at least two Earth extinctions'
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Telegram has exploded as a hub for cybercriminals looking to buy, sell and share stolen data and hacking tools, new research shows, as the messaging app emerges as an alternative to the dark web.An investigation by cyber intelligence group Cyberint, together with the Financial Times, found a ballooning network of hackers sharing data leaks on the popular messaging platform, sometimes in channels with tens of thousands of subscribers, lured by its ease of use and light-touch moderation.
Unlimited members in Telegram group now
Telegram has made it easier for its users to communicate, as it has introduced a feature that allows more than 200,000 users in a group chat. However, if the users in a group chat move past 200,000, it changes into "Broadcast Group", but the feature comes with a restriction. Groups with close to 200k members can be converted to a Broadcast Group that allows unlimited members. Only admins can post in Broadcast Groups, but everyone can read along and participate in group Voice Chats," Telegram added.
