You can see that the position of the star appears to have changed over the six-m

Question

You can see that the position of the star appears to have changed over the six-month time period However, it is actually the angle from which the photos were taken that has changed. During that 6-month period, the Earth moved from one side of the sun to the other. Using a stellar astrometric catalog, we find that the two stars closest to HT Cas are a distance of 0.01 arcseconds apart. parallax angle) to be approximately 0.015 arcseconds apart. Based on this information, we can estimate that the angle of shift of HT Cas (the We also know that the radius of the Earth's orbit is 1.0 A.U. (astronomical units) Using these two measurements, we can then determine the approximate distance to HT Cas using the following equation: p/2 d distance to HT Cas a=radius of the Earth's orbit p-parallax angle

Explanation / Answer

1).  

d = a / (p/2)

a = radius of the earths radius = 1 AU

p =parallex angle = 0.015 arcseconds

d = distance in parsecs

d = 1 / (0.015/2) = 133.33 parsecs

a- 133 parsecs

2).

1 parsecs = 3.2616 light years

133 parsecs = 133 x  3.2616 light years = 433.7928 light years

d - 434 light years

3).

No wew cant able to send any space probe to reach such a huge distanace it a very faar distance, even if we send any probe at an speed of light then it takes to reach the star at 434 yaers after so it is not possible

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