Section 1- Astronomy Flashcards
What are some scientific advancements for astronomy
Telescopes, space travel, Hubble telescope, gps
What is astronomy
What has it become?
Astronomy is the study of stars
It has now become the study of space
What are other Forms of scopes
Radio scopes, x-Ray, gamma ray scopes
Early history: early thought on stars?
They thought stars effected our past present and future “blame the stars”
What is the science that stars still have super powers
:astrology, the star arrangement effects our daily life
Stories and myths: what are clumps of stars: what is based off of them
Constellations, buildings such as monuments pyramids and other structures
Other practical uses for stars: what was used as a timeline
When to plant and harvest when to move when to hunt when to stay
How long was the first call ended and how was it made
It was made by how long it took each constellation to appear again. And it was 360 days but now we know a year is 365 1/4 days
Stars: direction indicators
Polaris (North Star)
Southern cross (crux)
East and west direction of stars more difficult
From astrology to astronomy: when, and what theory
100 bc and the geocentric theory which is the earth is the centre of the universe: all stars move around us and stars were on a single plane
Copernicus: when, his theory.
1500 ad, and he came up with the heliocentric theory which is the stars are on different planes and the sun is the centre of the universes
He had no proof so it was a hypothesis
What 3 scientists proved his theory
Kepler, Galileo, and Newton
What did Kepler do?
He proved that objects that are near move faster than distant objects, and objects in space are on different planes
What did Galileo do?
He improved the telescope “did not first create it” and used it to look at the stars with more detail and he saw not only stars but planets.
What did Newton do?
He provided proof that the sun has enough mass to hold objects in orbit and the earth does not so therefore the sun it the centre of the universe
*sun takes up over 99% of the universe
Astronomy of today: how many constellations are there?
88 however what constellations we see is not basses on their movement but rather our movement
Rotation by definition
Turning of the earth by its own axis
What is a solar day?
24 hrs
What is a sidereal day?
Rotation relative to stars in space is a little faster 23 hrs and 56 mins
Revolution by definition?
The movement of the earth around the sun
How long does one revolution around the sun take?
365 1/4 solar days
What is prehelion and aphelion?
Prehelion is when the earth is closest to the sun and it is jam 3rd
Aphelion is when the earth is furthest away from the sun and it is July 4th
How many degrees tilt is the earth on
23.5 degree as it rotates around the sun
Seasons are not effected by closeness to the sun but
Exposure time to the sun
