Chapter 10. The Milky Way and other Galaxies.
Test SEVEN includes questions of chapter TEN ONLY.
I encourage you to see the video-lectures of chapter TEN and the power point slides posted
on Bb under Information Type of Galaxies
Today I posted the last pa
The Milky Way (MW). Our Home Galaxy.
The MW and the Southern
European Observatory La Silla,
Fisheye view of the Milky Way.
Mont Megantic Observatory in
near-infrared light, HST Ultra Deep Field view
of the universe.
The faintest and reddest objects in the image are
galaxies that formed 600 million years after the
There are ~100 billion galaxies in the observable
See enlarged view
Main Points covered in the last class.
We need to know the value
of the Hubble constant Ho
because different values of
the constant will give
1- speed of recession for
the same distance
2- rate of expansion for the universe. (The expansion is
Spring (92.75 days)
Winter (88.75 days)
Autumn (89.85 days)
The Sun takes 240 million years to orbit the Milky Way Galaxy
The time the moon takes to orbit the earth once( sidereal month 27.3
days) Is the same time it takes to s
The Ionian sea is off the west cost of Greece.
Ionia : Their merchant traders were eager to adapt and promot
technology as it to help them become.
o Pythagoras of Samos (560-480 BC)
Thales of Miletus (624-546 BCE) predicted a
Textbook Martienez, Leonardo, My First Encounter with Astronomy,
revised edtition 2013
7 Blackboard quizzes
Constellation is a region or area in the sky of a group of stars that
resemble an object or picture
There are 88 offi
Interaction of electromagnetic radiation
(light) and matter.
Thermal Radiation and Radiation Laws.
The Doppler Effect
Nature of Light
What do we receive from the sky? light and cosmic rays.