The Sky is Our Laboratory Your Questions first How far away can we get out out in space today? Do you believe we have been to the moon? How big is the Universe? What percent of the total known Universe is our star (Sun)? Could there be anything faster than the speed of light?
How far away can we get out out in space today?
Do you believe we have been to the moon?
How big is the Universe?
What percent of the total known Universe is our star (Sun)?
Could there be anything faster than the speed of light?
Are the laws of physics universal?
Is it dark in space? Would a spaceship need headlights?
What are the exact definitions of galaxy and cosmos?
How are stars formed? Why do hottest stars die young?
What is the Orion Nebula?
Is a white dwarf just a giant diamond?
When were pulsars discovered? Do pulsars ever stop beaconing?
What are the theories about black holes?
Where do quasars come into the picture? What is a quasar?
What is the big, main bright core in the middle of galaxies?
How many different types of galaxies are there?
What is the Local Group?
What is a satellite galaxy?
What will eventually happen to the Universe?
What is the dark energy/matter?
4. What percent of the total known Universe is our star (Sun)? 5. Could there be anything faster than the speed of light?6. Are the laws of physics universal?
For instance, elliptical galaxies could be considered to consist entirely of a `bulge’. Most spiral galaxies have bulges.
There is a (now) well-known relation between the size of a bulge and the mass of the supermassive black hole in the center of a galaxy (the Magorrian Relation)
The twin 10-m Keck telescopes (Hawaii) are currently the largest telescopes in existence.
Plans for larger telescopes (up to 42-m) are currently being considered (ESO, USA)
Telescopes are `light buckets’.
The bigger, the more light they collect, and the more distant the objects they can observe.
The Universe is expanding (Ho=71 +/- 5 km/s/Mpc), and is ~13.5 billions years old.
No atmosphere in space
ACS and WFPC2: UV/Optical imagers
STIS: UV spectrograph/imager
NICMOS: Near-IR imager/spectrometer
ACIS: CCD imager/spectrometer (+ HETG)
HRC: High resolution camera (+ LETG)
IRAC: Mid-infrared imager
MIPS: Far-infrared imager/spectrometer
IRS: Mid-infrared spectrometer
Sept 21st, 2007:
An X-ray (Chandra) and infrared (Spitzer) light composition of a young stellar cluster, located only 420 ly away in the Corona Australis.
The X-ray emission comes from the hot coronae of the young, massive stars; the infrared light is a combination of dust and protostars emission.