
NASA @NASA
Astronomers used @NASAHubble to help calculate how long it took the light from an exploded star to reach Earth — about 1,700 years. But they had to trace it backward: https://t.co/H2qPcSSCrb https://t.co/oi1oBsmZDE — PolitiTweet.org
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Likely AvailableNASA @NASA
Astronomers used @NASAHubble to help calculate how long it took the light from an exploded star to reach Earth — about 1,700 years. But they had to trace it backward: https://t.co/H2qPcSSCrb https://t.co/oi1oBsmZDE — PolitiTweet.org