Astronomy Midterm 1.1-1.9
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19 Terms
What is astronomy
The study of the celestial objects that lay outside of Earth and how they interact with each other
Hypotheses
A possible explanation for a phenomenon. This can then lead to experimentation, which can either prove or dispprove a hypothesis.
Why is astronomy called a historical science
This is because a lot of the things we’re observing has already happened in the universe and there’s nothing we can do to change it
What is a light year?
A light year is a unit of measurement used by astronomers to measure distances in the universe. It is the fastest thing on earth and it moves at a constant speed.
How many kilometers is in a light year?
3 × 10^5
What is the benefit of the delay of light years?
We can receive information of cosmic events that happened years ago
Astronomical unit
The average distance between the Earth and the sun. 8 minutes old
How do you convert kilometers to miles?
Multiply km by 0.6
Planet
A celestial object that revolves around the sun and doesn’t produce its own light
Star
A celestial body that produces its own light
How are we able to see nearby planets?
This is because the light from our sun reflects off of nearby planets. This is why its harder to see planets further away
What fills the gap between stars?
Interstellar dust and gas
Dark material
Material we cannot detect with instruments but we know is there due to its gravitational effects on nearby celestial objects
Quasars
Centers of galaxies produced by gas that beam an insane light and allow us to see objects in the universe from a long time ago.
When on the cosmic calendar would humans appear?
December 31st
What makes a hypothesis testable?
It’s testable if it can either be supported or disproved through observations/experiments
Why do no number of experiments confirm a hypotheses?
You should conduct as many tests as possible as there could be a contradiction in one of your tests that disproves the hypothesis.
What is the Milky Way shaped as?
It’s shaped as a spiral disk with a ball in the middle
What are the events of the universe in calendar form?
The big bang happens in January, the Milky Way happens in May, the Solar System is created in September, life forms in November, and Humans appear December 31st