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... achieved a breakthrough. Please hold your thumb at arm's length and alternate closing your left and right eyes a few times. ...our thumb appears to jump left and right by a certain angle relative to the background... ove your thumb closer... and you'll see this jump angle growing. Astronomers call this jump angle ... e can... compare telescopic photographs taken six months apart, when Earth is on opposite sides of the Sun. ...Bessel noticed ... ...moved a tiny angle, revealing its distance to be almost a million times that to the Sun... Now that Bessel knew the distance he used... to figure out how luminous it was... in the same ballpark as the Sun... Giordano Bruno had been right after all! (en) |
