Part 8 in a series of videos produced by the ESA for public distribution about the Hubble Space Telescope and much more.
This video is Copyright Free material with some restrictions.
Find out more at: http://www.spacetelescope.org
Duration : 0:6:6
[youtube 23MXsnpC-5Y]
December 5th, 2009 at 7:01 am
they sure do. i …
they sure do. i think that answers your quesion
December 5th, 2009 at 7:01 am
on the whole, the …
on the whole, the outer boundaries of the universe are expanding. doppler shift in light suggests this.
But within the universe, in many places, there are galaxies on a colision course. Probably beacuse they are travelling towards each other, or because their gravitational pull attracts them towards each other.
Think of an atomic bomb explosion. The mushroom cloud grows bigger and bigger, but does that mean that dust/gas particles within the cloud do not collide with each other?
December 5th, 2009 at 7:01 am
A tiny spec of dust …
A tiny spec of dust Horton.
December 5th, 2009 at 7:01 am
Anyone know where …
Anyone know where to find more videos like what’s showing at 4:40 until the end of the clip. Is that infared and does anyone know how sped up the look back is?
December 5th, 2009 at 7:01 am
Well, of course: …
Well, of course: who knows what really happened? Running spacetime expansion backwards to some zero point is a logical exercise, but not nec what happened. You’re wrong: both EM and soundwaves demonstrate Doppler shifts, depending on where the observer is relative to source. Redshift IS Doppler but, as Einstein asks, are we moving apart or is the space between us expanding? The observed effect is the same.
December 5th, 2009 at 7:01 am
I didn’t say BB …
I didn’t say BB theory is generally ignored. I said that the evidence that debunks it is ignored. You’re wrong. Light wavelength redshift is NOT the same as the Doppler effect. This has been proven by the fact that pulsars whose redshift determined they must be millions of light years behind galaxies and accelerating, are actually being observed in front of them, between us and the galaxies that are supposed to be closer. It’s becomming somewhat more known, as truth is self evident.
December 5th, 2009 at 7:01 am
Inflation/BB Theory …
Inflation/BB Theory is excellent science, if not exactly what happened. Redshifts to nearby galaxies are ballpark accurate, (given the distances involved), supported by Cepheid and Type IA supernovae data, so current age/distance estimates are reasonably accurate. BB Theory is NOT generally ignored by the scientific “establishment.”
December 5th, 2009 at 7:01 am
hmmm, pretty …
hmmm, pretty interesting
December 5th, 2009 at 7:01 am
light based …
light based redshift is actually very inaccurate at determining velocity or distance. It was assumed that the Doppler effect observed in sound frequencies works the same as wavelengths. This has recently proven to be incorrect, so determining the age of the universe and indeed whether its expanding at all based on this leap in logic is bad science. In fact, there’s a lot of evidence that points to no big bang at all. It’s generally ignored by the scientific establishment.
December 5th, 2009 at 7:01 am
sounds like we’re …
sounds like we’re screwed
December 5th, 2009 at 7:01 am
everytime i watch …
everytime i watch things like this.i bring out my telescope and even then i wanna travel there
December 5th, 2009 at 7:01 am
You heard it right. …
You heard it right. The light from all galaxies we look at is red-shifted, which means those galaxies are moving away from us, EXCEPT for Andromeda, whose light is blue shifted, which means we’re moving towards one another. (Another exception are several small satellite galaxies that orbit our galaxy nearby… they are moving with us as we close with Andromeda.) Not to worry, tho, there’s ~3 billion years before we collide, and even then there will be few stellar collisions.
December 5th, 2009 at 7:01 am
thats odd as in the …
thats odd as in the last episode they said that the andomeda galaxy is on a collision course with the milky way. so how is that ? did i hear it wrong ??
December 5th, 2009 at 7:01 am
Excellent question. …
Excellent question. All galaxies are moving away from us, except Andromeda and our own satellite galaxies, Because they are moving away, their light is “red shifted”, which is the primary way we know the approximate distance to the furthest galaxies. Cepheids tell us the distance to nearby galaxies, and since we know the red shift to nearby galaxies, we can also estimate the distance to all galaxies by their red shifts.
December 5th, 2009 at 7:01 am
We can only look …
We can only look back into time, to when the universe was only a few billion years old. If spacetime expansion is correct, Hubble deep field is seeing a snapshot of the past when the universe was a tiny fraction of the size it is today. We cannot see the universe as it is today, except here on earth. Even the sun is nine minutes away in lookback time.
December 5th, 2009 at 7:01 am
Age estimates have …
Age estimates have ranged from 12 to 20 billion years over the last 30 years of science. It really depends on who you’re reading and what their observational data & theories are. Truth is, we don’t really know for certain.
December 5th, 2009 at 7:01 am
I looked up the Big …
I looked up the Big Rip theory in wikipedia after looking at your comment. Is “stretching the fabric of the universe” just a way of saying that c, the speed of light, is slowly decreasing to 0(when the rip happens)? It seems like the Big Rip describes how communication like interacting forces(gravity, light…) ends between an increasing number of objects with recession velocities that exceed c as c keeps approaching 0.
December 5th, 2009 at 7:01 am
Astronomer Fred …
Astronomer Fred Hoyle named it the “Big Bang” in derision, and I admire his scepticism. It’s a neat theory to extrapolate expansion backwards to a single point of energy, but not necessarily what happened. Guth’s inflation theory and current data suggesting we’re “speeding up” and may speed up to a Big Rip only prove that we don’t really know the whole picture. Until we unify quantum mechanics and gravity, we won’t know. Great theories, tho. Even string theory. Very elegant.
December 5th, 2009 at 7:01 am
i heard it will …
i heard it will take like 50 billion years for the big rip to happen
December 5th, 2009 at 7:01 am
This was my …
This was my favorite of all nine chapters. I only hope the fate of the universe is less depressing than the Big Rip.
December 5th, 2009 at 7:01 am
Big Bang?.. Yes!
Big Bang?.. Yes!
December 5th, 2009 at 7:01 am
big bang???? hmmmm …
big bang???? hmmmm……. nope.
December 5th, 2009 at 7:01 am
Around 14 billion …
Around 14 billion years!!! :O
December 5th, 2009 at 7:01 am
Hear no Evil See no …
Hear no Evil See no Evil Feel no Evil…..
The truth will set you free…. =D
December 5th, 2009 at 7:01 am
@ cronoslogic – …
@ cronoslogic – actually the width of the visible universe is more like 78 billion light years, not million … at the time of writing, that is.