Hubble Definition and 271 Threads

It is emphasized by Mr. bradenberger the concept of super Hubble subhorizon fluctuations. I appreciate the idea that Hubble radius and horizon are different ideas since they are physically distinct and particle horizon depends on the dynamics of cosmos evolution while Hubble radius only depends...

I'm trying to calculate the diffraction limit/angular resolution for the Hubble Space Telescope. I know this can be found using the formula: \theta = 1.22 \frac{\lambda}{D} Where \lambda is the wavelength of the light being observed and D is the diameter of the objective lens (2.5 m on...

I'm trying to calculate the diffraction limit/angular resolution for the Hubble Space Telescope. I know this can be found using the formula: \theta = 1.22 \frac{\lambda}{D} Where \lambda is the wavelength of the light being observed and D is the diameter of the objective lens (2.5 m on...

What is a Hubble Space Telescope and how does it work?

http://www.msnbc.msn.com/id/28622042/

Irene Klotz, Discovery News, 12th Jan 09- http://dsc.discovery.com/news/2009/01/12/strange-light-hubble.html and from the Hubble site- http://hubblesite.org/newscenter/archive/releases/2009/04/

Photo of Einstein, Hubble, and LeMaitre together?? Hey, I was wondering if anyone knew where i could find a picture of Einstein, Hubble, and LeMaitre together. I think they were all together in California in the 1930s and if anyone knows anything about this, i'd really appreciate the insight...

Can anyone help me with this question? Or at least lead me in the right direction? Two students are having a discussion after studying the Hubble Law. Student 1: According to the Hubble Law space is expanding. Therefore our galaxy is bigger today than it was in the past and will keep...

Due to a http://www.baltimoresun.com/news/local/bal-md.hubble30sep30,0,7125042.story" , Hubble has been silenced.

Hubble+/- 4.3%, is the constant "constant"? Why is the Hubble constant assumed to be "constant"? Just to keep things simple a la Occam's razor? Or is there a lot more to it than that? With further increases in the accuracy of its measurement, and a few centuries to make repeated...

I came across this interesting Havard article at http://www.cfa.harvard.edu/~huchra/hubble.plot.dat listing over 600 Hubble survey results dating back to about 1929 and up to 2008. I put all the data into into a spreadsheet and using over 500 Hubble estimates from 1960 onwards I got an average...

I am presently reading a paper on Inflation. It uses the term Hubble length. Can someone provide the Hubble length in cm.

It seems to me that in an expanding universe where the expansion rate is accelerating, that the Hubble constant will be greater for near stars than the constant for far stars that were receding at lower rate at the time the light from them was emitted. So when I see a cosmology calculator...

Use Kepler’s laws to determine the period of the Hubble Space Telescope which orbits the Earth at an altitude of 610 km. I'm using the equation i know to find the period of an object revolving around another object T^2=Kr^3 T^2=(4pi^2/GM)*r^3 G=6.67 x 10^-11 M=5.98× 10^24 (Mass of...

Hi, I am in my second astronomy course and just received a twenty question take home final exam, and I am having trouble with two of the questions. In 2004 astronomers reported finding evidence that certain white dwarfs are 12.1 +- 0.9 billion years old. Assuming an inflationary model in...

The Question One possible value for the Hubble constant is 65Kms Mpc. Calculate in Mpc, the distance from Earth for agalaxy trallening at the speed of light, 3.0\times10^{8} Attempt v=Hd v=3\times10^8 H= 65Km s Mpc First I will convert the constant to ms so that I have both in...

was just reading about the Hubble ultra deep field photo / life the universe etc; here http://en.wikipedia.org/wiki/The_Universe they re saying they can photograph the universe to 13billion light years distant / back in time (hubble photo caption a little way down says "Hubble...

Hello, A couple of questions: The distance to the moon is calculated as increasing by 38 millimetres per year by the laser ranging work of NASA following Apollo 11. When I apply the Hubble expansion coeficient to the centre to centre distance from Earth to the Moon, I get just over 28...

It's quite simple Physics to show that the moon landing sites cannot be imaged by Hubble as its angular resolution is too small. So how come: "Prof Steve Beckwith Director Hubble 1998-2005 "we could easily image the light from a firefly at the distance of the moon" What am I missing here?

What would happen if the area a galaxy occupied spanned the influence of gravity and the Hubble flow?

The purpose of this thread is to further discuss the concept of the Hubble expansionary flow in our local region -- which is too small to be considered homogeneous for the purposes of the Friedmann equations, say up to a radius of 100 Mpc from us. (A megaparsec (Mpc) equals about 3.25 million...

If the Hubble parameter is always decreasing for very early stages of Big Expansion of manifold (i.e. Big Bang), then what was it decreasing from?

What is the role of Cepheid stars in determining the Hubble parameter?

A little plug for my supervisor and former group. After a couple of years work with a very clever (zero read noise) CCD and a bit of clever DSP programming they now have a system which takes a sequence of very short exposures, picks the ones in which the atmosphere is frozen to give an...

Hubble "Parameter"& acc. Universe I am a senior high student. And I am studying on SnIa. I recently read that SOME(maybe most) theory said that hubble's constant is not a CONSTANT, it's changing by time. But I wonder if there are something influent the data. (like "slection effect" .etc)...

I found the following definition for the Hubble Radius: The radius of the Hubble sphere (Hubble radius) is defined to be the distance from a fixed point O (center of coordinate system) of an object moving with the cosmological expansion at the speed of light (with respect to O)...

I was staring at my calculus book when this came to me, so apologies if its a little murky. I've been thinking about Hubble time and noticing something odd, that my astronomy professor really couldn't (or wouldn't) answer. t(u)= 1/H x 10e12 years which didn't quite work because if the...

http://science.discovery.com/tvlistings/episode.jsp?episode=0&cpi=111531&gid=0&channel=SCI" The above is a link to a Discovery Science channel show. It is a must watch for all man is space enthusiast. It is on Sunday 11 Mar at 6pm. (that is tonight for this post.)

How are Nucleosynthesis and Hubble expansion are considered as an evidence for the Big Bang Theory?

I have a decent question, I think, about the Hubble photos and the universe. When the Hubble took the photos that show stars cluttered together, and that it is supposedly the first few hundred thousand years of the universes life, that got me thinking. If you pointed the Hubble in any given...

Qw The Hubble telescope has a primary mirror with diameter 2.4 m. Calculate the angular resolution of the Hubble telescope in both radians and degrees at a wavelength of 600 nm. Imagine that the Hubble telescope images the surface of the moon, 3.84*10^8 m away. What is the smallest feature on...

http://physicsweb.org/articles/news/10/11/16/1 Latest data from Hubble indicates that: What are the ramifications of this finding for the various TOEs we have?

NASA plans to service HST. http://news.yahoo.com/s/ap/20061031/ap_on_sc/shuttle_hubble

I thought it was toast - apparently not: http://www.usatoday.com/tech/science/space/2006-09-21-atlantis-hubble_x.htm Sweet.

Just got through reading http://www.space.com/scienceastronomy/060807_mm_huble_revise.html" about findings that suggest the Hubble constant is about 15% smaller than previously believed. From the article: The new finding implies that the universe is. . . about 15.8 billion years old and...

http://www.forbes.com/infoimaging/2006/06/30/hubble-nasa-ball_cx_dl_0630hubble.html And here I was actually worrying about it! :rolleyes: You know, after our Mars-exploring president murdered it with a blunt axe: http://www.msnbc.msn.com/id/6853009

70 \frac{km/s}{Mpc}*\left(384400\ km\right)=8.72028137*10^{-10}\frac{m}{s} 8.72028137*10^{-10}\frac{m}{s}*\frac{3.1556926*10^{7}\ s}{yr}=2.75185274\ \frac{cm}{yr} http://www.google.com/search?q=70+km%2Fs%2FMpc+*+384400+km+*+1+year http://www.google.com/search?q=1+year+%2F+1+second&btnG=Search...

Why do some photos have black squares cut out of them from hubble, like this: http://nssdc.gsfc.nasa.gov/image/astro/hst_antennae_9734a1.jpg

http://spaceflightnow.com/news/n0601/09milkyway/ http://spaceflightnow.com/news/n0601/11hubbleorion/

http://hubblesite.org/newscenter/newsdesk/archive/releases/2005/33/full/

I did look through this forum for other threads on this topic, but didn't find any. If this has already been discussed, then please let me know where the thread is. A common model for the expanding universe is an expanding balloon upon which some dots have been drawn. A well know flaw in this...

NASA'S HUBBLE REVEALS POSSIBLE NEW MOONS AROUND PLUTO Using NASA's Hubble Space Telescope to view the ninth planet in our solar system, astronomers discovered Pluto may have not one, but three moons. If confirmed, the discovery of the two new moons could offer insights into the nature and...

I was just reading about the Hubble Telescope and I saw something saying that the planetary camera on it had a field of view of 2.5' x 2'. I don't actually know anything about astronomy so I was just curious what the field of view is? I found that the ' meant arcminutes, but that doesn' help...

http://www.planetary.org/voyager_hubble/

You know, there are many things in astrophysics, that i do not understand :smile: For example, this thing of the Hubble distance. At distances that exceed the Hubble distance the universe is expanding with velocities that are bigger then the speed of light. Suppose that in this region a...

I've just been thimking of some potenial problems with the "expanding universe" and its supposed acceleration. Objects further away are traveling faster. Does this mean it is speeding up or was it oroginally traveling faster during the big bang, and that's why it's further away? The age of...

What is the magnitude of the Hubble length and what does it signify? Also, does anyone have any idea what the estimated mass of the universe is.

I heard the decision this morning to drop the Hubble Space Telescope into the Pacific Ocean. I wondered what the required delta v would be to move the Hubble into a "safe" service orbit nearer the ISS. The rescue options that have been most public have been either a robitic service mission or...

http://www.msnbc.msn.com/id/6853009/ the white house cut entire budget for hubble "NASA told to focus on destroying telescope safely"

Hubble got this forumula , Density=kH^2 k=constant H=Hubble constant What are the experimantal difficulties in determining the density of the universe accurately ? Ans:The mass of the whole universe is difficult to find same to the volume as well...what else ?please help me out...