With which of the following observations could Tycho have demonstrated that a comet must be a celestial phenomenon? (Note: you may want to review Ch. 2)
A)measuring changes in its brightness over time
B)from the comet causing a full solar eclipse across much of Europe
C)parallax measurements from observing it from two locations on Earth

Question

Quizplus · Accepted Answer

Parallax measurements involve observing an object from two different locations and measuring the apparent shift in its position. This can be used to determine the object's distance. If Tycho had measured the parallax of a comet, he would have been able to demonstrate that it was beyond the Earth's atmosphere and therefore a celestial phenomenon. Measuring changes in brightness or causing a solar eclipse could not definitively prove this point.

With Which of the Following Observations Could Tycho Have Demonstrated