Sunlight takes approximately 8 minutes and 20 seconds to reach Earth, meaning we see the Sun as it was in the past; if the Sun vanished, Earth would continue to experience both sunlight and the Sun's gravitational pull for about 8 more minutes because changes in gravity propagate at the speed of light.
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The Sun Could Vanish — And We’d Notice Late本站添加:
If the Sun vanished right now, Earth would not know for 8 minutes. Light does not arrive instantly. Sunlight takes a little over 8 minutes to reach Earth.
So, if the Sun disappeared this second, the sky would keep shining for about 8 more minutes. Earth would also keep feeling the Sun's gravity for that same delay, because changes in gravity travel at light speed. For a few minutes, everything would look normal after the disaster had already happened.
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