Question

question 1
describe the differences between a geocentric model and heliocentric model. what model is the current sun - earth - moon system based on?

question 2
if the earth blocks light from the sun during a lunar eclipse, why does the moon appear red when it passes through the umbra?

question 3
briefly explain why the moon doesnt have an atmosphere or plate tectonic activity.

Explanation:

Question 1

The geocentric model posits Earth at the center of the universe with the Sun, moon, and planets orbiting it. The heliocentric model places the Sun at the center, with Earth and other planets orbiting around it. The current understanding of the Sun - Earth - Moon system is based on the heliocentric model, supported by evidence like stellar parallax and the laws of planetary motion.

During a lunar eclipse, when the moon passes through Earth's umbra, sunlight has to travel through Earth's atmosphere to reach the moon. Earth's atmosphere scatters blue - violet light more than red light (Rayleigh scattering). So, the remaining light that reaches the moon and is reflected back to us is mostly red, making the moon appear red.

The moon has a low mass, resulting in weak gravitational force that is unable to hold a significant atmosphere. For plate tectonics, it requires internal heat to drive convection currents in the mantle. The moon has a small core and has cooled down over time, lacking the necessary internal heat for plate - tectonic activity.

Answer:

The geocentric model has Earth at the center, while the heliocentric model has the Sun at the center. The current Sun - Earth - Moon System is based on the heliocentric model.

Question 2