Ib Physics IA Commentary Topics Astronomical distances Help

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Astronomical distances-
Our universe is composed of mostly empty space with occasional encounters of matter apart large distances.
A light year is a unit of measurement of ultra-solar system distances. It’s the distance traveled by light in one year. The speed of light is 3*10^8m/s. You can find out the number of seconds in a year by multiplying the number of seconds in a minute (60) by the number of minutes in an hour (60), then multiplying that by the number of hours in a day (24) and multiplying that by the number of days in a year (approximately 365.25). One light year is thus approximately equivalent to 9.46 x 10^15m, which is also approximately equivalent to 0.3068 parsecs (pc).

Example: The distance to the nearest star other than the Sun (Proxima Centauri) from the Earth is 4.31 light years, which is equivalent to 1.3pc. This means that it would take 4.31 years to send or receive a message to/from Proxima Centauri by electromagnetic wave transmission.

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