1. A star is 520 light years from Earth. During what event in history did the light now arriving at Earth leave the star?

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A light year is the distance which is equal to 9,460,730,472,580.8 km, so:  

= 4.91957985 X km  

which is distance travels by the light.  Now what time it takes light to travel distance we found.  

A year has 365.25 days, so,

= 31557600 seg/year

The light speed in the space is equal to 299,792.458 km/s, so:  

4.91957985 x = 520 years

if today, August, 2020, then

2020 - 520 = 1500

Spanish and Portuguese spread out over the southern part of the Western Hemisphere and bring in America brought to Spanish colony of Santo Domingo in year 1500.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in