Parallax Questions: Confirm Answers are Right?

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In summary, The conversation is about confirming answers to two questions related to time and distance in outer space. The first question is about the time it takes for light to travel from a galaxy 2 billion light years away, with the answer being 2 X 10^9 years. The second question is about the distance to the nearest star, with the answer being 3.77 X 10^12 km. The person responding to the original question confirms that the first answer is correct, but suggests that the second answer may be off by a factor of 10.
  • #1
pianoparadise
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Can somebody please confirm that my answers are right?
1. At what time on Earth did the light start from a galaxy 2 billion light years away?
My answer was 2 X 10^9 years. This problem seemed too easy to be true.

2. How far is the nearest star in kilometers (about 1.3 par sec away)?
My answer: 3.77 X 10^12 km

Thanks for the help!
 
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  • #2
Welcome to PF, pianoparadaise.

In the first question, if it's light that we're seeing "now," then you're answer is right.

As for the second, if it's the nearest star to the solar system, then the answer is off by a factor of 10 or so.
 

1. What is parallax and how does it affect our perception of objects?

Parallax refers to the apparent shift in the position of an object when viewed from different angles. It affects our perception of objects by giving us a sense of depth and distance.

2. Can parallax be used to measure the distance of objects in space?

Yes, parallax can be used to measure the distance of objects in space. By observing the shift in the position of an object when viewed from two different points, scientists can calculate the distance of the object using parallax equations.

3. How does parallax affect the accuracy of measurements?

Parallax can affect the accuracy of measurements if it is not taken into consideration. When viewing an object from different angles, the apparent position of the object may change, leading to inaccurate measurements. However, parallax can also be used to improve accuracy by providing multiple points of view.

4. What are some examples of parallax in everyday life?

Some examples of parallax in everyday life include the apparent shift of objects when viewed from different angles, the use of parallax in photography to create a sense of depth, and the use of parallax in virtual reality to create a more immersive experience.

5. How does parallax play a role in astronomy?

In astronomy, parallax is used to measure the distance of stars and other celestial objects. By observing the apparent shift in the position of a star from different points on Earth's orbit, scientists can calculate the distance of the star using parallax equations. This helps us understand the scale of the universe and the distance between objects in space.

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