ASTR 2010 Cosmology
Homework #5
Due Friday, November 2, in class
1] Big Bang nucleosynthesis.
[a] Which elements emerged from the Big Bang? Which elements owe their origins to massive
stars?
Hydrogen (1H), helium (4He), and a tiny bit of lithium (6 Li,7 L
ASTR 2010 Cosmology
Homework #6
Due Friday, November 16, in class
1] Cosmology & the high-redshift Universe: Give a short description of each of the following:
(Hint: In addition to the text book Your Cosmic Context, Google and Wikipedia are useful.)
[a]
ASTR 2010 Cosmology
Homework #1
Due Friday, September 14, in class
1] Size of the Universe today: Our Universe is ~13.7 billion years old. Light, emitted by the hot
plasma soon after the birth of the Universe has been traveling towards us at the speed of
ASTR 2010 Cosmology
Homework #2
Solutions
1] Orbits: Consider an asteroid orbiting the Sun at a distance of 4 Astronomical Units. The
Earth orbits the Sun with a speed of 30 km/s.
[a] Does this asteroid orbit the Sun faster or slower than the Earth orbits
Eric Spector ASTR 2010 Modern Cosmology 2/6/08 Writing Assignment #2 Thermal Radiation Thermal Radiation, otherwise known as "blackbody radiation," is most easily described as the temperature dependence of a photons interaction with atoms and molec
ASTR 2020
Space Astronomy
Introduction
Instructors
John Bally
D349 Duane
303 492 5786
[email protected]
casa.colorado.edu/~bally/
Office hours:
Wednesday
1:00 PM - 2:00 PM
Thursday
11:00 AM - 12:00
noon
or by appointment
Help is also available in
ASTR 2020
Space Astronomy
Week 2: Wed.
The Winter sky .
Infrared view of winter sky (10 - 120 m)
Star
A large, glowing ball of gas that generates heat and light through
nuclear fusion
Visual wavelength
UV & X-ray wavelengths
Properties of Thermal Radiatio
ASTR 2020
Space Astronomy
Week 3: Monday
W-band
(94 GHz,
4 mm)
amplifier
3.5 cm (X-band) VLA receiver
Single sideband mixer:
Local oscillator
Down-converted signal
Frequency
Band-pass of amplifier:
Intermediate frequency = IF
Double sideband mixer:
Local
ASTR 2020
Space Astronomy
Introduction
ASTR 1200: Why
Space
Astronomy ?
Limitation of Astronomy from the ground:
Earths atmosphere is opaque at most wavelengths.
Atmospheric Windows:
Visual, near-IR, radio
Turbulence: Limit angular resolution to ~1 arc-se
ASTR 2020 Space Astronomy
Homework #2
1] Orbits: Consider an asteroid orbiting the Sun at a distance of 4 Astronomical Units. The
Earth orbits the Sun with a speed of 30 km/s.
[a] Does this asteroid orbit the Sun faster or slower than the Earth orbits the
ASTR 2020 Space Astronomy
Homework #1
Due Friday, 22 Jan 2016, in class
1] Size of the Universe today: Our Universe is ~13.7 billion years old. Light, emitted by the hot
plasma soon after the birth of the Universe has been traveling towards us at the spee
ASTR 2020 Space Astronomy
Homework #1
Due Friday, 22 Jan 2016, in class
1] Size of the Universe today: Our Universe is ~13.7 billion years old. Light, emitted by the hot
plasma soon after the birth of the Universe has been traveling towards us at the spee
ASTR 2020
Space Astronomy
Week 2
Clicker Test:
The number of arc-seconds in a radian is:
1) 1
2) 200
3) 206,265
4) 2x106
The Golden Age:
Seeing what we can t see (with our eyes)
- Electronics & silicon technology
=> sensors at all wavelengths
- Large tele
ASTR 2020 Space Astronomy
Constants of Nature, typical units of measure, and physical & astronomical formulae (14 Aug 2016):
Some constants of Nature:
G = 6.67 x 10-8 c.g.s. Newtons gravitational constant
Units: [cm3 s-2 g-1]
c = 2.998 x 1010 cm s-1 Speed
ASTR 2020 Space Astronomy
Homework #2
Due Tuesday: 20 September 2016
1] Orbits: Consider an asteroid orbiting the Sun at a distance of 4 Astronomical Units. The
Earth orbits the Sun with a speed of 30 km/s.
[a] Does this asteroid orbit the Sun faster or s
ASTRONOMY 2010: 01-15-08 Hubble's Law: v = H0 D (velocity km/sec; Distance M pc) v~D 01-17-08 Hubble's data gave: H0 = 500 km/s/Mpc v = Measure the v from the Doppler shift (redshift) H0 Hubble Constant in (km/s per Mpc) D Measure galaxy distance by
ASTR 2010 - Modern Cosmology Professor Michael Shull (Astrophysics) HOMEWORK #4 (February 28, 2008) due: Thursday March 6, in class
1
Black Hole Sizes and Time-Variability
In both Newton's and Einstein's theories of gravity, there is a radius of a
ASTROPHYSICS REVIEW Radiation Process o Flux and Magnitude: The flux is radiative energy moving in the form of photons at a certain distance from the source, per unit time, per unit area. Inverse square law. Apparent Magnitude is a measure of the brightne
ASTR 2010 Cosmology
Homework #4
Due Friday, October 26, in class
1] Black hole in the Galactic Center, located at a distance of 8.5 kpc.
[a] If the black hole in the center of our Galaxy has a mass of 4 million Solar masses, how large
will its event horiz
ASTR 2010 Cosmology
Homework #3
Due Friday, October 19, in class
1] General Relativity: What is the principle of equivalence?
Acceleration due to gravity identical to acceleration in space due to a rocket
Free-fall in gravitational potential identical to
ASTR 2010 Cosmology
Midterm #1
Friday, 5 October 2012, in class
1] The Universe:
Approximately, what is the composition of our Universe? Please give the relative percentages of each
component.
Ordinary (baryonic) matter made of atoms (electrons, protons,
ASTR 2010 Cosmology
Midterm #2
Friday, 9 November 2012, in class
NAME:_
1] The Big Bang Cosmology:
Describe three (3) lines of evidence for a 13.7 billion year old Big-Bang Universe. State what the
evidence is, and provide for each a few sentence descript
ASTR 2020
Space Astronomy
Week 4
Tues:
Birth of Spaceflight & Space Astronomy
Review HW#1 & solutions
Example problems: Spacecraft Kinetic E
A communications link budget
with photons
Thurs:
Orbits:
Balance of opposing forces
Gravity <=> Centrifugal force
ASTR 2020
Space Astronomy
Week 3:Tuesday
Review: EM waves,
Structure of matter
Announcements:
Observing at SBO tonight
Review of Electro-magnetic (EM) Waves:
[wavelength][frequency = [speed of light]
Energy of Photons (particles of light)
Momentum:
= c
E
ASTR 2020 Space Astronomy
Homework #1
Due Tuesday, 6 September 2016, in class
The goal of this homework is to get you used to using large numbers, scientific powers-of-ten
notation, and some astronomical scales. You may find the Constants and Formulae pos
ASTR 2020 Space Astronomy
Homework #1:Solutions
Due Friday, 6 Sept. 2016, in class
The goal of this homework is to get you used to using large numbers, scientific powers-of-ten
notation, and some astronomical scales. You may find the Constants and Formula
ASTR 2020
Space Astronomy
Week 4
Atoms (hydrogen, etc.)
Motion, Energy, Gravity, Orbits
Wednesday we meet in Fiske Planetarium
Why do atoms only emit certain
frequencies & wavelengths (spectral lines)?
Wave nature of matter:
momentum: p = mV = h/h/p
E = h