Astronomy 1021 Lecture Notes - Lecture 35: Vesto Slipher, Hubble Space Telescope, Hubble Deep Field

• School: Western University
• Department: Astronomy
• Course: Astronomy 1021
• Professor: Robert Cockcroft

Document Summary

Everywhere the same: then, stars would cover the night sky, the entire night sky should be as bright as the sun, this (cid:272)o(cid:374)trast to o(cid:271)ser(cid:448)atio(cid:374)s is k(cid:374)o(cid:449)(cid:374) as ol(cid:271)ers(cid:859) parado(cid:454) Big ba(cid:374)g & ol(cid:271)ers" paradox: so, from what we see, you can derive a couple of options. The universe is changing over time: big bang theory: we can only see a finite number of stars/galaxies because the universe began at a moment. We built the hubble space telescope to find out. Even farther out there: same idea, but even longer observations at a different part of the sky, this time, the harvest is about 10,000 galaxies. The importance of the hdf: with well over 100 billion galaxies each hosting of the order of 100 billion stars. Comparable to the number of grains of sand on all beaches on earth: the hdf ser(cid:448)ed a(cid:374)other purpose; for (cid:449)hi(cid:272)h (cid:449)e(cid:859)ll first (cid:374)eed to u(cid:374)dersta(cid:374)d hu(cid:271)(cid:271)le(cid:859)s la(cid:449)