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Sky & cycles

Why Does Sunlight Take More Than Eight Minutes to Reach Earth?

Light moves at an incredible speed - almost 300,000 kilometres per second. Even so, it needs time to cross the cosmic distance between the Sun and Earth.


On average, about 150 million kilometres separate us. The journey from the Sun’s surface to Earth therefore takes roughly 8 minutes and 20 seconds.

This means we always see the Sun as it was several minutes ago. If we imagine the impossible and mentally “switch it off,” Earth would continue receiving its previous light for more than eight minutes.

The delay from the stars is even more impressive. Light from the nearest star beyond the Sun takes more than four years to reach us. Some points in the night sky show objects as they were hundreds or thousands of years ago.

Looking into space literally means looking into the past. A telescope does not transport us through time; it receives light that began its journey long before it reached our eyes.

Yet every morning, this eight-minute traveller still arrives at our windows almost exactly on schedule.

The stars speak. You decide.


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