402 Answered Questions for the topic astronomy

03/19/19

Relationship between Mars and Earth rotation?
Is it by pure random chance that Mars and the Earth have nearly the same day duration (Mars day is barely 40 minutes longer, which is just 3% difference), or there is some causal relationship... more
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Astronomy Space Visible Light

03/18/19

What does the sky look like to human eyes from orbit?
There are numerous pictures, obviously, of the blackness of space from the shuttle, the space station, and even the moon. But they all suffer from being from the perspective of a camera, which is... more
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03/18/19

Is there any advantage in stacking multiple images vs a single long exposure?
Suppose I have a source object that is not time varying, to be concrete let's say it's a galaxy. Is there anything additional that can be learned or done with multiple short exposure images of... more
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03/15/19

What is the most compelling evidence of General Relativity in the presence of matter and energy?
The most oft-cited [triumphs](http://en.wikipedia.org/wiki/Tests_of_general_relativity) of GR are things such as the shifting perihelion of Mercury, gravitational redshift experiments, and... more
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Astronomy Geometry Moon Sun

03/15/19

How can a full moon be seen south of an observer's location?
I know this seems like a simple question, but I'm trying to debate with a flat earth theorist. I asked him to explain why can the ISS visibly be seen orbiting the Earth with the naked eye, and he... more
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03/15/19

What are the different ways to measure the spatial curvature of the universe?
Just what the question asks. Assuming the Friedmann-Rovertson-Walker (FRW) metric, what measurements can be performed to determine the spatial curvature of the universe.
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03/13/19

Do photons lose energy while travelling through space? Or why are planets closer to the sun warmer?
My train of thought was the following:The Earth orbiting the Sun is at times 5 million kilometers closer to it than others, but this is almost irrelevant to the seasons.Instead, the temperature... more
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Astronomy

02/25/19

Astronomy ch 3 pg 94
An astronaut in space is floating 10 meters away from the command module, whose mass is 6000 kg. If the astronaut's mass is 80 kg, what is the gravitational force acting on the astronaut due to the... more
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Astronomy Space

02/14/19

is it possible to create an assembly line of space stations throughout our solar system to study it.?

to be able to have better data regarding our solar sytem.
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Astronomy Math Science

11/20/18

Calculate the lifetime of a 4 MSun star.
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Astronomy Math Science

11/20/18

The Sun has a radius of 6.955×105 km and a mass of 1.989×1030 kg. What is the density of the Sun?
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Astronomy

10/14/18

Astronomy - Escape Velocity
The escape velocity at a given position near an object is higher for both _____ distance from the object's center and _____ mass for the object.a.) smaller/smallerb.) smaller/largerc.)... more
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Astronomy

09/30/18

f you weigh 100 pounds on Earth and go to a planet that is 1/2 the mass of earth and 1/2 the size of Earth, what is your new weight on that planet?
Its related to newton law of gravity, but I just don't understand the math.
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09/29/18

If at the formation of the Earth we had a rock with 1000 atoms of Potassium-40 inside, about how many Argon-40 atoms would be found in that rock today?
Potassium-40 decays to Argon-40 with a half-life of 1.25 billion years.   Multiple choice options   <<1 1  25 100 250 500 999
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09/20/18

Planet X is 10 times farther from the Sun than Earth (10 AU). How long does it take this planet to go around the sun?
please help me I'm dumb. keps 3rd law
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Astronomy

09/19/18

You have discovered the planet Zoltron. It is 13.0 times farther from the Sun than Earth (13.0 AU). How long does it take this planet to go once around the Su
end answer in years
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Astronomy

02/18/18

How fast is this star moving?
A line in a star's spectrum lies at 400.0 nm. In the laboratory, that same line lies at 400.2 nm. How fast is this star moving? Is it moving towards or away from us?
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01/31/18

describe two very different observations that are caused by the same thing
In 5-10 sentences, describe two very different observations that are caused by the same thing. This question can be interpreted in a variety of ways; the link between your observations may involve... more
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01/27/18

Acceleration is defined as the change in velocity over time so a=v/t.
If you have a car that can accelerate with a=5m/s^-2, how long does it take the car to reach a velocity of v=25m/s^-1 (which is equivalent to 90km/h) ? Show all the steps taken to get to the answer.  more
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Astronomy Algebra Conversions

01/27/18

The Earth travels with a speed of of 30km/s around the Sun on its orbit. What is the distance the Earth travels in a week? Note that one day has 86,400s.
Show all the steps taken to get to the answer. 
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Astronomy Algebra Conversions

01/27/18

How many times do we have to put our Galaxy side by side to reach the Andromeda Galaxy?
Note that the diameter of the Milkyway is 100,000 light years. The distance to the Andromeda Galaxy M31 is 2.5 Million light years. Show all the steps taken to get to the answer. 
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Astronomy Algebra Conversions

01/27/18

How many meters are in a light year? Note that a year is roughly 3.14x10^7 s.
Show all the steps taken to get to the answer. 
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01/27/18

The mean distance between the Earth and the moon is roughly 384,000km. How long does it take light to travel from the Moon to Earth (c=300,000km/s) ?
Please show all the steps taken to reach the answer. 
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12/01/17

What are 4 reason earth isn’t shaped like a cube?
without knowing it’s a sphere but how do we know it’s not a cube? Why can’t it be a cube 
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12/01/17

What are 4 facts we know earth isn’t shaped like a donut?
Some Earth facts, reasons why it’s not donut shape. 
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