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“超级地球”或六光年以外的生命_我的网站

醉玲珑

一 | Kyiv, Oct 20 (UNI) Ukraine's national energy company has urged citizens to "charge everything" by 7 am ON Thursday because of expected power cuts caused by Russian missile strikes.
Energy plants were hit by Russian missiles again on Wednesday -- part of a wave of such strikes since October 10, BBC reported.
Outages of up to four hours at a time will affect the whole country on Thursday, the BBC quoted grid operator Ukrenergo as saying.
It comes as Russia declares martial law in areas of Ukraine it has annexed. Heightened security measures have also come into force in Russia -- mostly areas along the Ukraine border.
In preparation for the blackouts, Ukrenergo has appealed to Ukrainians to stock up with water and ensure they have "warm socks and blankets and hugs for family and friends".
Phones, power banks, torches and batteries need to be charged, it urged.
On Thursday, President Volodymyr Zelensky said 30 per cent of Ukrainian power stations had been destroyed by Russian air strikes.
Ukrenergo said there had been more attacks on power facilities in the past 10 days than in the whole preceding period since Russia's invasion on February 24.
Ukrenergo said power cuts may occur "throughout Ukraine from 7am to 10 pm" and advised citizens to check the regional network operators' websites to see where and when exactly.
Sporadic power cuts have already affected parts of the capital Kyiv and many of Ukraine's regions. Russian missiles have damaged infrastructure all across Ukraine, including cities like Lviv in the west -- a long way from the fighting.
Authorities have urged Ukrainians to reduce their power use in the evenings. "We do not rule out that with the onset of cold weather, we will ask for your help more often," Ukrenergo said.
US President Joe Biden said Vladimir Putin was running out of options in Ukraine.
"It seems his only tool available to him is to brutalise individual citizens in Ukraine to try to intimidate them into capitulating," he said.
UNI MR。研究人员发现，六光年之外的巨型超级地球行星可能有简单的生命。巴纳德B（或GJ699B）是一颗最近发现的绕巴纳德轨道运行的超级地球行星，它是离地球最近的第二颗恒星。巴纳德B被认为是极冷的，其温度与欧洲相似，大约在零摄氏度以下150度。但研究人员说，它的铁/镍“核心”温度相当高，地热活动非常强烈。维拉诺瓦大学的天体物理学家爱德华·桂南在美国天文学会的一次会议上说：“地热能支持地下生命带，就像南极洲的地下湖泊一样。”“我们知道，欧罗巴的表面温度与巴纳德B的相似。但是由于地热条件，液态水可能会在木卫二冰冷的表面下。如果存在水，地热可能会导致冷地表下存在液态水的“生命带”。这种情况与结冰的欧罗巴非常相似。”我们已经把注意力集中在巴纳德身上一段时间了，”约拿说。

二 | 发现巴纳德B行星最重要的意义是在离太阳最近的两个恒星系统中都有行星。”这支持了先前基于开普勒望远镜数据的研究，即行星在银河系中普遍存在，甚至有数百亿个行星。恩格尔说：“巴纳德B被认为是一颗质量超过地球三倍的岩石行星。巴纳德的寿命大约是太阳的两倍。它已经存在了大约90亿年前，太阳存在了46亿年前。宇宙中的一些行星，即地球的大小，在地球上，甚至在太阳上存在了很长一段时间。巴纳德B的质量是地球的三倍多，其轨道半径与水星的大致相同，在巴纳德（红矮星）周围有233天的轨道周期。

三 | 朱纳说，虽然亮度很低，但将来可能用一个很大的望远镜“拍摄”巴纳德B，“这样的观测将揭示大气、表面和宜居性的特性。”虽然表面温度在零下150度左右，但科学家相信冰下有液态水可以维持生命。巴纳德B被认为是一颗岩石行星，比地球大至少3.2倍。巴纳德B号的主恒星巴纳德距离地球6光年，在天文尺度上距离很短，亮度只有太阳的0.0035倍。