3 True and False question in Earth Science ?

1. In the modern apparent magnitude system, a first magnitude star is 10 times as bright as a second magnitude star.


2. One light year is equal to 100 astronomical units.


3. THe parallax second or parsec is used to measure distance to the nearest star and is equal to 3.258 light years.3 True and False question in Earth Science ?
1. false. A magnitude 1 star is 100 times as bright as a magnitude 6 star.





2. false. One A.U. is about 8 light-minutes. 100 a.u. is about 800 light-minutes.





3. false. The distance given for the parsec is correct, but the nearest star is 4.2 light years away, not 3.26.