On December 22 2017, NASA published “Views of Home” which gave an article with a video including various pictures of Earth and other planets. The images of Earth were in various forms meaning that the moons shadow could be seen reflected off the Earths surface from different angles. These pictures of Earth were also taken at different locations within space. Spacecrafts that were sent into space for specific missions were bringing back important images of Earth that are abled to be viewed for the benefits of scientists and researchers. Different distances produce multiple variations of Earth as it is less visible farther away compared to a closer captured image. As these pictures are seized, it can be seen the relation of Earth with other planets such as the moon.
This article covering the look of the Earth from space correlates with conceptual objective four. Conceptual objective four asks to describe how the heliocentric model of the solar system was developed and why it was adopted over the geocentric model of the universe. When watching the video that illustrates the article as well as displaying the images of Earth, the models of the universe can be seen through the pictures. Specifically, at the time 0:51 the universe with all the planets in their fixed positions exhibit the heliocentric model with the sun motionless at the center and the imaginary lines of the planets that revolve around it. In addition, at the time 1:25 it is revealed that the earth is traveling around the sun while the moon is orbiting around the Earth with indication from the imaginary dotted lines. In these two different images the information gathered regarding this objective is presented.
Conceptual objective four was best understood through a variety of in class information. Starting with powerpoint notes and moving towards pages in the Lecture- Tutorial as well as clicker questions and planetarium demonstration was all done relating to information on this objective. Observing Retrograde Motion on pages 99-100 was completed and reviewed discussing the planets movement in comparison and contrast with the stars. A planetarium demonstration showed this topic real well when watching the path of Mars among the stars which viewed Mars as moving prograde motion going west to east with the stars and other times in retrograde motion going east to east with the stars. Slides that covered this objective discussed ideas of the geocentric universe, epicycles, Copernicus, and the heliocentric universe. Along the span of understanding this concept, clicker questions were asked to gather a better understanding of the objective.
There was a collection of knowledge to be grasped when discussing this objective. I gained an insight to the geocentric model being that the Earth is motionless at the center while other planets circle around the Earth. The geocentric model also explains that while circling the Earth, the planets are moving within their own circles called epicycles. This model was not suitable and was adapted to fit varying factors. The heliocentric model was developed by Copernicus which stated that the sun is motionless as the center while other planets circle around the sun. This model described how the Earth rotates on its axis and all planets move around the Sun in circles and their own epicycles. In addition, I learned that planets move with prograde and retrograde motion. Compared to the stars, when a planet moves with prograde motion the planet appears to move west to east in relation to the stars. When a planet is moving with retrograde motion, the planet appears to move east to west compared to the stars. Regardless of whether the planet is moving in prograde or retrograde motion, the planet will always rise in the east and set in the west. The majority of this information was acquired through notes of powerpoint slides and answering of the Lecture- Tutorial.