I the distance to a star is around 750 x 1018 m when this, Ask an Expert

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(i) The distance to a star is around 7.50 x 10¹⁸ m. When this star was to burn out today, in how many years would we witness it disappears?

(ii) Determine how long does it take for sunlight to reach the Mercury?

(iii) Determine how long does it take for a microwave radar signal to travel from Earth to the Moon and back?

(iv) Determine how long does it take for a radio wave to travel once around the Earth in a great circle, close to the surface of planet?

(v) Determine how long does it take for light to reach you from a lightning stroke 9.3 km away?

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