5 Answered Questions for the topic Universe

Universe Physics Space Gravity

03/24/21

One of the moons of a planet orbits at a distance of 9405 km from the center of the planet. If the mass of the planet is 6.42 ✕ 1023 kg, what is the period of the moon?
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06/15/19

How do we estimate $10^{23}$ stars in the observable universe?
Now, I read somewhere, that there are 4,106,234 stars in the observable universe. How did scientists estimate this?
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05/13/19

How is it possible for astronomers to see something 13B light years away?
In a NPR News story from a few years back:> "A gamma-ray burst from about 13> billion light years away has become> the most distant object in the known> universe."I'm a layman when it... more
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04/12/19

Am I attracting Pluto?
My question is simple: as the title says, **am I exerting a force over for example Pluto**, although it is a **very small** force, it is there, right? Or maybe let's go further: **Am I exerting a... more
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05/22/16

significance of satellites for our understanding of the universe?
and any examples? thank you so much
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