ASTRONOMY Lecture Prac1
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What are the 3 "hallmarks of science?"
- seeks explanations for observed phenomena that rely on natural causes
- it progress through creation and testing: Models of nature that explain the observations as simple as possibleModels must make testable predictions about natural phenomena; It would have to force to revise or abandon a previous point or position.
What is pseudoscience?
Any subject that appears scientific, but doesn't follow the 3 "hallmarks" of science.
What are some example of Pseudoscience? Why?
Because these ideas cannot be repeated or tested !
- Alien abductions
What are some attributes of pseudoscience claims?
- use of vague, exaggerated // untestable claims
- over-reliance on confirmation rather than refutation
- lack of openess to testing (progress)
- misleading language
What is the building block of matter?
When atoms are combined, what do they fom
What are the three particles present within a molecule?
Electron, Proton, and Neutron.
What are the measurements of an average atom?
- nucleus = 10-15 entire atom = 10-10
What are the forces that hold atoms together?
- Strong force
- Weak force
- Electromagnetic force
- Gravitational force
What are the four states of matter?
As far as astronomy and space works, heavier elements are created when _______ ______.
As far as astronomy and space works, heavier elements are created when stars explode.
What is the formula for Energy?
E = mc2
You can ______ or ______ atoms to create energy.
You can combine or destroy atoms to create energy.
This is an example of _____?
This is an example of _____.
What does the term "half-life" refer to?
"Half-life" is the amount of time it takes for half of the mass to convert and decay.
breaking bigger nuclei into smaller - creating energy.
combining smaller nuclei into a bigger nucleus - getting/creating energy.
What powers the stars?
75% of the world is ____.
24% of the world is ____.
What makes up the sun?
73.5% Hydrogen, 24.8% Helium, 0.788% Oxygen, 0.326% Carbon, 0.118% Nitrogen
The ability to do work is?
The basic unit for energy is ____.
The rate in which energy is used is _____.
The sun is hydrostatic equilibrium. This means that the sun is ...?
Nor shrinking or contracting.
Who was the first to use a telescope?
He was not the inventor of the telescope; however, he was the first to use it to observe the sky. (to record and explain what he saw).
What were some of Galileo's first observations?
- the moon had mountains and valleys
- milky way had stars
- Jupiter had 4 moons; it introduced the idea that something besides the earth was the center of the universe. sunspots
- phases of Venus
What was the name of the program Galileo published that was banned by the church?
Dialogo dei Massimi Sistemi
Why was "Dialogo dei Due Massimi Sistemi" banned by the church?
Because Galileo basically, personally insulted the Pope with it.
If you build a telescope twice as big, you gain _ _____ as much light.
If you build a telescope twice as big, you gain 4 times as much light.
What are three of the main functions of a telescope?
- light gathering
Light speed is a constant, and is represented by what equation?
c = 3 x 108 m/s
The longer the wave length the _______ the color.
The longer the wave length the redder the color.
The shorter the wave length, the _____ the color.
The shorter the wave length, the bluer the color.
Visible light has a wave length of:
400 - 700 mm. [4 x 10-7 -- 7 x 10-7]
Angles are measured in degrees.
- 1 degree = 60 arcminutes
- 1 arcminute = 60 arcseconds
- 1 degree = 3600 arcseconds
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