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10 Étoiles et Histoire
Raisonner et argumenter
a. En observant l'étoile Epsilon Cygni en 2017, les astro-
nomes la voient telle qu'elle était en 1945, à la fin de la
Seconde Guerre mondiale. Détermine, en justifiant ta
réponse, la distance en année-lumière séparant cette
étoile de la Terre.
b. Associe chaque étoile à l'événement qui se déroulait
sur Terre au moment où elle émettait la lumière que
l'on reçoit en 2017. Explique ton raisonnement.



Answer :

GinnyAnswer
- The distance in light-years separating the star Epsilon Cygni from Earth can be determined by the difference in years between 2017 and 1945. Since light travels at a speed of about 186,282 miles per second (or approximately 300,000 kilometers per second), we can calculate the distance by multiplying the speed of light by the difference in years. This will give us the distance in light-years. - To associate each star with the event happening on Earth when its light was emitted, you need to consider the concept of light-years. Light-years measure the distance light travels in one year. So, when we observe a star that is, for example, 10 light-years away, we see the light that left that star 10 years ago. Therefore, the light we see from a star today is a snapshot of what was happening on Earth at the time that light began its journey towards us. This can help you link each star to significant events on Earth based on the time it takes for light to travel from that star to Earth.

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