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| 23 |
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(1992) COBE team announces structure seen in CMB
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| 24 |
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(1967) Parachutes on Soyuz 1 fail to deploy on descent. Cosmonaut Vladimir Komarov did..
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| 25 |
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(1990) Hubble Space Telescope (HST) was launched on the space shuttle Discovery.
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| 26 |
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(1920) Shapley and Curtis debate "The Scale of the Unieerse".
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| 27 |
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(1961) Explorer XI launched. First space-borne gamma ray telescope.
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| 28 |
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(2003) Galaxy Evolution Explorer (GALEX) launched.
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