ASTR 2020
Space Astronomy
Week 5
Planetary & Astronomy Probes
Announcements:
Observing at SBO: 7:00 PM Wed
Astronomy Satellites
https://en.wikipedia.org/wiki/List_of_space_telescopes
List of Solar System Probes
https://en.wikipedia.org/wiki/List_of_Solar_System_probes
Apollo Mission to the Moon
https://en.wikipedia.org/wiki/List_of_Apollo_missions
Echo (1960 - 1964)
Telstar-1 (1962)
Relay 1
Andover, Main
Crawford Hill
A. Penzias
R. W. Wilson
The Expanding Universe
Velocity = H0 x Distance
H0 ~ 72 km s-1 / Mpc
(km / mega parsecs)
V=HxD
The only possible law that has no
“Center of the Universe”!
( There is a “Center of the Universe” at the
Hertzberg Institute for Astrophysics in Victoria, British Columbia )
Balloon analogy for expanding
Universe
No center
No edge
Cosmic abundance of the Elements:
Big Bang
Stars
Big Bang Nucleosynthesis:
Abundances vs.Current density
Allowed
by
observations
The entire Sky at Infrared Wavelengths:
Cosmic Microwave Background
(COsmic Background Explorer - COBE)
2.728 K Black Body
Remove constant
background (2.728 K):
Solar motion
at ~600 km/s toward
Virgo (Doppler shift)
Cosmic Microwave
Background (CMB)
Remove Solar motion
“CMB” + Galactic Plane dust
Remove model of
dust emission
=> True CMB
Cosmic Microwave Background
(Wilkinson Microwave Anisotropy Probe - WMAP)
Snapshot of the Universe when it was 380,000 yrs old
Then: 1/2 temperature of Sun’s surface:
(13.7 billion years ago!)
Today: 3 C above absolute 0!
ASTR 2020
Space Astronomy
Week 5
Planetary & Astronomy Probes
Announcements:
Observing at SBO: 7:00 PM Wed
tonight
Astronomy Satellites
https://en.wikipedia.org/wiki/List_of_space_telescopes
List of Solar System Probes
https://en.wikipedia.org/wiki/List_of_Solar_System_probes
Apollo Mission to the Moon
https://en.wikipedia.org/wiki/List_of_Apollo_missions
Perseus cluster of galaxies: visual
D ~ 68 Mpc
Central galaxy NGC1275: Visual (HST)
Central galaxy NGC1275: Visual (HST)
Central galaxy NGC1275 : X-ray (Chandra)
M87 in Virgo:
Visual (HST)
X-ray (Chandra)
Radio (VLA 1.4 GHz)
Centaurus A (nearest radio galaxy)
X-ray, radio, visual
ASTR 2020
Space Astronomy
Week 5
Planetary & Astronomy Probes
Announcements: HW# due next Fri.
Gravity Waves Detected from
a black hole merger!
Gravitational Waves Detected from
a black hole merger!
• Merger of 36 Mo + 29 Mo black holes
• Remnant mass = 62 Mo
• ~3 Mo radiated away as gravity waves
• Distance ~ 400 Mpc
LISA:
Laser Interferometer Space Antenna
PPTA
= Pulsar Position Timing Array
Stellar Evolution