科研之友
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<正>前不久,天文学家们拍到了史上首张黑洞照片。在过去相当长一段时期内,黑洞就是一个看不见、摸不着,仅存在于科学家们想象和推算中的神秘天体。如今黑洞照片的面世使黑洞理论得到了验证。What is a black hole?Black holes are one of the most mysterious and powerful forces in the universe.A black hole is where gravity has become so strong that nothing around it can escape,not even light.The
