Question

Observational proof of the heliocentric model:Astronomers have made many observations since the days of Galileo and Kepler to confirm that the Sun really is at the center of the solar system, and that the planets revolve around the Sun in elliptical orbits. Which observation(s) could you make today that Galileo and Kepler could not have made to confirm that the heliocentric model is correct?Check all that apply.a. Doppler shifts in stellar spectra of nearby starsb. Stellar parallax in nearby starsc. Orbital periods of Jupiter's moonsd. Transit of an extrasolar planet

Answer 1

a Doppler shifts in stellar spectra of nearby star.

Step-by-step explanation:

Doppler effect it was discover centuries after Galileo and Kepler. It was proposed by the scientist Christian Andreas Doppler in 1840´s and around that years others scientist started to do some experiments to find the same effect.

Also Galileo could observe the moons of Jupiter thanks to a telescope that he built. At the begging, he thought it was some other stars near the planet. He named them as Medician planets, in honor to the Medici family because there were four.

Both Kepler and Galileo always made drawings of the sky, that means that any changes like parallax stars or the movement of an extrasolar system like meteorites.

Hope this info is useful.