How far is one light-year?
Driving one light-year would take 10.8 million years!
ແສງໄວທີ່ສຸດໃນຈັກກະວານ ປະມານ 300,000 ກມ./ວິນາທີ — 1 ວິນາທີ ອ້ອມໂລກໄດ້ 7.5 ຮອບ.
ໂລກ ຫາ ດວງເດືອນ: ແສງໃຊ້ 1.3 ວິນາທີ. ດວງອາທິດ ຫາ ໂລກ: ປະມານ 8 ນາທີ 20 ວິນາທີ. ຍານ Voyager 1 (ອອກເດີນທາງປີ 1977) ຈະໄກຮອດ 1 ວັນແສງ ໃນວັນທີ 18 ພະຈິກ 2026.
1 ປີແສງ = 9.46 ລ້ານລ້ານ ກິໂລແມັດ — ຂັບລົດ 100 ກມ./ຊມ. ຕ້ອງໃຊ້ 10.8 ລ້ານປີ. ດາວທີ່ໃກ້ທີ່ສຸດ Proxima Centauri ໄກ 4.24 ປີແສງ.
ຈື່ໄວ້: ປີແສງ ແມ່ນ "ໄລຍະທາງ" ບໍ່ແມ່ນ "ເວລາ".
Sources: IAU, NASA/JPL Voyager team, EarthSky
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