知识世界

Astronomy:Searching for Black Holes

Once， the universe was viewed as serene and unchanging entity. But today we know of great cosmic forces power beyond deＳＣＲＩＰＴion. Astronomers believe this power comes from the dark force of giant black holes. Galaxy NGC 1275 is a galaxy that could solve the mystery of the most powerful objects in the universe.

• 01

  Astronomy： Threat from Space

  
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  Astronomy： Galileo and the Milky Way

  
• 03

  Astronomy： Spacefiles — Lord of the Rings

  
• 04

  Astronomy： Spacefiles — Venus

  
• 05

  Astronomy： Spacefiles — Sun

  
• 06

  Astronomy： The Story of Aviation

  
• 07

  Astronomy： Spacefiles — Galaxy

  
• 08

  Astronomy： History of the Race to the Moon

  
• 09

  Astronomy： Deep Impact

  
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  Astronomy： Edwin Powell Hubble and the Expanding Universe