An angstrom is 1x10-10 meters, used to measure wavelengths, named after Anders Angstrom.
The speed of light is about 300,000 kilometers per second.
Copernicus is widely credited as the father of heliocentrism, he wasn't the first to propose it but he
Moon Position Activity (due at Stage 2) (40 points)
Brief Overview of Activity: Over a period of at least three consecutive evenings, you will make
careful observation of the Moon's changes in appearance and position.
Required Items: a notebook to take no
Star Count Activity (due at Stage 3) (40 points)
Brief Overview of Activity: Determine the number of stars visible to the naked eye by
collecting sample star counts over a small area of the sky.
Required Items: a ruler (marked in centimeters), one small c
1. Suppose a mineral sample contains a radioactive isotope that has a half?life of one billion
years. Suppose that chemical tests prove the mineral has one?fourth of its original content of this
radioactive element. How long ago did t
1. What is your latitude? What is the elevation of the North Star? In other words, how many
degrees is it above the horizon as seen from your location?
Olathe, KS =38* North
The elevation of Polaris=38* Polaris reveals your latitude.
1. Rank the following in order of increasing wavelength
the output of an ultraviolet tanning lamp,
a radio broadcast of Saturdays big football game,
leakage from a very cheap microwave oven,
a beam of red light, and
the X rays in you
1. Evaluate the scientific reliability of each statement below, and decide how reliable
each argument is.
Einstein said that mass can be converted to energy, so it must be true. There
is no evidence in this statement, so therefore cannot be considered
4. Kepler believed that the motions of the planets were governed by mystical relations between
numbers. Following this belief, he showed in his third law that the orbital period always
followed a certain relationship to the distance
Ggravitonal constant =
N m /k g
6.421 0 kg
3.39710 6 m
2(6.671 011 N m2 /k g2 )(6.421 023 kg)
3.3971 06 m
5.01 03 m/s
or about 5 km/s
*I dont think we as the US has reached the capabi
Historical Development of Astronomy
Week 3 Presentation
From Greeks to Newton
Plato (427-347 B.C.E)
o Aristotle (384-322 B.C.E)
o Ptolemy (85-165 B.C.E)
o Nicolaus Copernicus (1473-1543 C.E)
o Tycho Brahe (154
Mass of Jupiter Activity (due at Stage 1) (25 points)
Brief Overview of Activity: Using a modified version of Kepler's third law, and orbital data
from one of Jupiter's moons, the mass of Jupiter can be determined.
Required Items: a calculator, your textb
THE LIFE CYCLE OF A STAR
NEBULA - a cloud of gas (hydrogen) and dust in space. Nebulae - birthplaces of stars. Different types of nebula: An
Emission Nebula e.g. such as Orion nebula, glows brightly because the gas in it is energized by the stars that hav
Week 5 Questions/Problems
1. Asteroids are classified according to their chemical composition. S-type asteroids contain a lot of
silicates, C-type asteroids contain a lot of carbon, and M-type asteroids are largely metallic.
2. They have very li
Week 7 Questions
1. If you look at a clear dark sky at night, you can see a faint, white band of light across the sky that
we call the milky way. Why does our galaxy look like a band of light across the sky? Why dont we
see that whiteness all ov
The process of science
How is a scientific theory different from the popular use of the word theory?
Scientific models or theories are used to attempt to describe but also explain what we see. In a scientific
theory, there needs to be a lot of evidence su
1. What causes the atoms in that nebula to emit light?
An emission nebula- Orion Nebula is an example of an emission nebula- is produced when the
nebula is near enough to a star that the radiation from the star ionizes the gas. A gas is ionized
when one o
Week 4 Questions
1. Mercury is the closest planet to the sun. One reason why there is such a huge temperature
change in mercury from day to night is because the planets position and also because of the
elliptical orbit rotation which makes it pa
Moon Observing ActivityPage 1 of 5
Observing the Moon
Systematically observe the phases of the moon. Based on its motion and phases for
a few days, predict how it will continue to change. Continue to observe the moon to test
Solar System Scale Model
ASTR 100, University of Maryland University College
Dr. Matt Bobrowsky
Mahogany Corina, Francisco Fuentes, William Hatfield, Kelvin Le, Amber Levy
To start the process of building a scale model of the solar system, the first thing
Star Count Activity (Project 5)
Brief Overview of Activity: Determine the number of stars visible to the naked eye
by collecting sample star counts over a small area of the sky.
Required Items: a ruler (marked in centimeters), one small cardboard tube (th
HR Diagram Activity (Project 6)
Brief Overview of Activity: Use an HR diagram to learn about
the differences between the stars in our stellar neighborhood and
the brightest stars in the sky.
Required Items: HR diagram (HT-Groups.pdf) & data (HRData.pdf) o
Measure the Diameter of the Sun
Images Diameter Suns Diameter
Images Distance Suns Distance
100 cm Suns Distance
100 cm 150 million km
1.5 million km