A star is 20 light years away from the earth .suppose it brightens up . Suddenly today.After how much time shall we see this change?
Answers
A lightyear is a system of the astronomical measure similar to the distance on which a light approximately travel in one year.
So one light year is equal to 9.4605284*10^(15) m, and in that case, if a star is ten light years away and brightens up suddenly, it will take around 10 years to see the changes happened on the earth.
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Answer:
Question1
Morning star is the name given to
(a) Pole star (b) star Sirius (c) planet Jupiter (d) planet Venus
Answer.
(d) Morning star is the name given to the planet Venus because sometimes it appears in the eastern sky before sunrise.
Question2
Which of the following figures depicts the position of Pole star correctly?
ncert-exemplar-problems-class-8-science-stars-solars-system-1
Answer.
(a) Pole star is always situated in the North direction of the earth’s axis.