How did NASA discover these exoplanets, after all, they are forty light years away, and they started looking there back in the seventies?

How did NASA discover these exoplanets, after all, they are forty light years away, and they started looking there back in the seventies?

The Search for Life Beyond Earth in Space & Time – James L. Green, NASA | Hancock Symposium 2020

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answers (2)

Answer 1
August, 2021

Those planets more than 40 years old, the closest planet to us in another system in 4 light years, the proximal center is called, for observing the planets, the size of the planet is important, not just the distance.

Answer 2
August, 2021

The fact that before them 40 St. years means that the light comes from them to us for 40 years and that we see their condition, which was 40 years ago. The planets themselves are much older by "age", so you can start watching them at any time.

How they are discovered:

1. biguniverse.ru

2. thequestion.ru

3. ru.wikipedia.org

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