What is the primary cause of seasons on Earth? Earth's axial tilt and its orbit around the Sun Earth's changing distance as it orbits around the Sun The influence of the zodiac The gravitational pull of other Solar System planets The Sun's changing activity levels 2 pts The Sun and the Moon have nearly the same angular size on the sky. This means that: O The Earth is flat O The two have the same physical size O Since the Sun has a much larger physical size, it must be further away than the Moon O They're both located the same distance away from Earth O Since the Moon has a much smaller physical size, it must be further away than the Sun How do astronomers measure the distance to objects in space? (Within our own galaxy) O With a ruler O Spectroscopy O Parallax Doppler Effect O Refraction. Who was the first scientist to suggest that planets orbit in ellipses? Johannes Kepler Claudius Ptolemaeus Isaac Newton Galileo Galilei O Leonardo da Vinci
