8.2 - Discovering the solar system - Archive Flashcards
What is the geocentric model?
It is a model in which the Earth is at the centre of the solar system, in which the sun and the rest of the visible planets of the solar system orbit.
What is the heliocentric model?
It is a model that shows the modern-day understanding of the solar systems in which the solar system orbits the sun and the moon orbits Earth, this model does not include the not visible planets though (Uranus, Neptune).
What is retrograde motion?
Orbital or rotational motion of an object opposite the rotation of the center object.
What are some things Galileo Galilei discovered?
- Craters on the moon.
- the rings of Saturn.
- the four largest moons of Jupiter
- that Venus went through phases just like the moon.
What are constellations?
Patterns of stars that are shaped into recognisable pictures that different cultures look at differently.
What are some dwarf planets?
Eris, Pluto, Charon, Makemake, Haumea.
What were the guidelines put in place to set aside dwarf planets and planets?
- it is in orbit of the sun.
- has sufficient mass and gravity to be nearly spherical.
- It has enough gravity to clear the neighbourhood around its orbit of dust, rock and other objects.
What is the order of the planets?
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. (My very excited mum, Jiafei sat upon Nate)
When was Pluto discovered and when did it become a dwarf planet?
Pluto was discovered in 1930 by Clyde Tombaugh and was demoted to a dwarf planet in 2006.
What planets are we not able to see with the naked eye and why?
Uranus and Neptune because they can only be seen by a telescope.
When were rockets developed?
In the mid 12th century.
