Answer:
B. get smaller
Explanation:
The parallax angle of a star measured with respect to the Earth is inversely proportional to the distance of the star from the Earth:

where
is the parallax angle, measured in arcsec
d is the distance between the star and the Earth, measured in parsec
Therefore, if the star Alpha Centauri is moved farther from Earth, then d increases, and therefore the parallax angle will get smaller.
Gravity<span> attracts </span>all objects<span> towards one </span>another<span>.</span>
D: Ptolemy envisioned a geocentric model, while Copernicus envisioned a heliocentric model.
This is in the thermosphere which is at an altitude of 85-520km
Magnitude of displacement = 
Adding the squares gives displacement = 
Displacement =
≈ 724.7m