Download First Week slides - UNLV Physics - University of Nevada, Las Vegas

Introduction
Astronomy 104
Introduction and Overview
Stephen Lepp
University of Nevada, Las Vegas
Physics Department
Disability
What is Ast 104?
If you have a documented disability that may require assis-
What should you do:
Read the Book before class
Outline the material
Attend Lectures
Fill out your outline
tance, you will need to contact the Disability Services (DS)
Grading
0652.
ability Services is located within the Learning Enhancement
Services (LES), in the Reynolds Student Services Complex,
Suite 137. The phone number is 895-0866 or TDD 895-
Astronomy 104 – p.2/26
Astronomy 104 – p.1/26
Magic of good grades
for coordination in your academic accommodations. Dis-
Attend Lectures
In a land of science and a time of university the
grades of a great student rest on the shoulders of
an old man. His name: Dr. Lepp
Astronomy 104 – p.3/26
Attend Lectures
Learn what I thought was important
A good friend is someone who visits you while
you are in prison.
A really good friend is
someone who comes to hear your lectures.
Lectures will expand on some material
Ask questions
Slakan saying:
“Rates of Exchange”
Malcolm Bradbury
Astronomy 104 – p.4/26
Ancient Sky
Astronomy 104 – p.5/26
days of the week
Stars
Sun
Moon
Five Planets (Mercury, Venus, Mars, Jupiter,
Saturn)
Comets and asteroids and other small bodies
nebula
Astronomy 104 – p.7/26
Sun
Moon
Mars
Mercury
Jupiter
Venus
Saturn
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Astronomy 104 – p.6/26
Average Distance from Sun (AU)
domingo
lunes
Tiw
martes
Odin miércores
Thor jueves
Frigg viernes
sábado
Mercury
0.39
Venus
0.72
Earth
1.00
Mars
1.52
Jupiter
5.20
Saturn
9.54
Uranus 19.18
Neptune 30.06
Pluto
39.5
Astronomy 104 – p.8/26
Astronomy 104 – p.9/26
Outer Planets
Inner Planets
Planet Fun Facts
Mercury is closest and takes 88 days to travel
round the sun
Mars
Neptune
Earth
Uranus
Pluto is furthest (on average) and takes 248
years to travel round the sun
Venus
Mercury
Jupiter
Mercury, Venus, Mars, Jupiter and Saturn are
visible to the naked eye
Saturn
Pluto was discovered by an American in
1930.
Pluto
Astronomy 104 – p.10/26
Stars
Astronomy 104 – p.11/26
Giant Star
Astronomy 104 – p.12/26
Dwarf Star
Stars are millions of times further
Other solar systems other planets
Range in mass from
1
10
to 100 times our sun
Range in Luminosity from
times our sun
1
10000
to 100000
Astronomy 104 – p.14/26
Astronomy 104 – p.13/26
Scientific Notation
Powers of Ten
Express numbers in a general form,
n
X × 10 ,
which is convenient for both large and small
numbers.
So for example 2.3 × 103 is 2300, 2.3 × 1040 is
23000000000000000000000000000000000000000
and 2.3 × 10−3 is 0.0023. What is 4 × 102 ?
Astronomy 104 – p.16/26
0.000000001
0.000001
0.001
0.01
1
100
1,000
1,000,000
1,000,000,000
10−9
10−6
10−3
10−2
100
102
103
106
109
Astronomy 104 – p.15/26
Powers of Ten
a billionth
a millionth
a thousandth
a hundredth
one
a hundred
a thousand
a million
a billion
nanomicromillicenti-
0.000000001
0.000001
0.001
0.01
1
kilo1,000
mega- 1,000,000
giga- 1,000,000,000
tera1,000,000,000,000
Astronomy 104 – p.17/26
10−9
10−6
10−3
10−2
100
103
106
109
1012
n
µ
m
c
one
k
M
G
T
Astronomy 104 – p.18/26
Sample Quiz
Question
The following questions are a sample quiz.
Answer
1. What is Ast 104?
(a) Stars and Galaxies
(b) A Lot of FUN
(c) A science requirement
(d) all of the above
(e) none of the above
Astronomy 104 – p.19/26
Question
(d) All of the above.
Ast 104 is not Stars and Galaxies, but “Stars and
Galaxies” is the title of the course, which will certainly be a lot of fun and fulfill the science requirement.
Answer
1. What is the farthest Planet to the sun?
(a) Mars
(b) Mercury
(c) Earth
(d) Moon
(e) Pluto
Question
(b) whomever wrote this question was apparently
unaware Pluto is no longer a planet.
Neptune is the furthest planet from the Sun.
Astronomy 104 – p.22/26
Answer
(b) 7,000
Astronomy 104 – p.25/26
Astronomy 104 – p.21/26
Astronomy 104 – p.20/26
Astronomy 104 – p.23/26
1. What is 7 × 103 ?
(a) 700
(b) 7,000
(c) 7,000,000
(d) 0.007
(e) 0.0007
Astronomy 104 – p.24/26