Astronomy Exam #1 Questions With Complete Solutions.
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Course
Astronomy
Institution
Astronomy
Astronomy Exam #1 Questions With Complete Solutions.
What is a star?
A star is a large luminous ball of gas that generates heat and light through nuclear fusion.
What is a planet?
A planet is a moderately large object that orbits a star. It shines by reflected light.
Planets may be icy or ro...
Astronomy Exam #1 Questions With Complete Solutions.
What is a star?
A star is a large luminous ball of gas that generates heat and light through nuclear
fusion.
What is a planet?
A planet is a moderately large object that orbits a star. It shines by reflected light.
Planets may be icy or rocky
What is a moon?
A moon (or satellite) is an object that orbits the planet.
What is an asteroid?
An asteroid is a small and ROCKY object that orbits a star.
What is a comet?
A comet is small and ICY object that orbits a star.
What is the SOLAR SYSTEM?
The solar system is a star and all of the material that orbits it; including it planets,
moons and asteroids.
Our Solar System is the Sun, Earth, Mars...
What is a nebula?
A nebula is an in stellar cloud of gas and or dust and it is indicative of star birth or star
death.
What is a galaxy?
A galaxy is a great is a great island of stars in space, all held together by gravity orbiting
the common center.
An example: The Milky Way
What is a Local Supercluster?
A local supercluster is groups of galaxies that are typically clustered
What is the definition of a Universe?
The universe is the sum total of all matter and energy that is everything within and
between all galaxies.
What are the two elements that everything comes from since the Big Bang?
The two elements are Hydrogen and Helium.
H + He
How big is a Light Year?
a light year is 300 thousand kilometers per second or 300 million minutes per second.
3x10⁸ m/s
About 10 trillion kilometers
What is the equation for one light year and what does a light year measure?
A light year equals the speed of light times one year.
A light year measures distance.
Powers of 10
, 10⁶ = 1,000,000
10⁰ = 1
10⁻¹ = 0.1
Powers of 10: Rule of Multiplication
10^A x 10^B = 10^(A+B)
Powers of 10: Rule of Division
10^A / 10^B = 10^(A-B)
The LARGE Scale Nomenclature
Kilo = 1,000 = 10³
Mega = 1,000,000 =10⁶
Giga = 1,000,000,000 = 10⁹
Tera = 1,000,000,000,000 = 10¹²
The SMALL Scale Nomenclature
Milli = 0.001 = 10⁻³
Micro = 0.000001 = 10⁻⁶
Nano = 0.000000001 = 10⁻⁹
Pano = 0.000000000001 = 10⁻¹²
How Big Is The Universe?
The universe is about 400 billion stars in the Milky Way.
The Milky Way is one of about 100 billion galaxies
There are as many stars as the amount of grains of sand.
10¹¹ stars times 10¹¹ galaxies equals about 10²² stars in the universe.
What is the Cosmic Calendar?
The cosmic calendar is a scale on which we compress the history of the universe into 1
year.
For example: In a cosmic year, human existence in about a second.
In what ways do humans employ scientific thinking?
Scientific thinking is based on everyday ideas of observation and trial-and-error
experiments.
What are the dangers of common sense?
Common sense often works well for humans and typically breaks down at the frontiers
of science.
For example, by saying the earth is not flat being compared to earth orbits the sun
needs science to prove it.
What are facts?
Facts are sometimes referred to as empirical evidence and derived from experiments
and they must be repeatable.
What is a hypothesis?
A hypothesis is an untested idea that can explain a phenomenon.
What is a theory?
A theory is a hypothesis which test have failed to disprove.
It is not an undisputed facts.
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