Starship Asterisk*

Chris wrote: The only mechanism by which galaxies will go dark is the ultimate burning out of all the stars, leaving behind cold gas and dust too thin to initiate new star formation, and the hulks of old stars: black holes, neutron stars, and white dwarfs. The Universe is nowhere near old enough for...

Chris wrote: Ernie wrote: 1. What then is the conceptual eventuality for the massive black hole? 2. Without the tell tale ejection jets, how can we detect the presence of massive black hole wandering in space? Is it gravitational lens effect only? 3. Presence of dark matter is not directly observed ...

neufer wrote: Why do I get the feeling that I'm being asked to do someone else's homework assignment Huh? Can an ordinary drop out joe blow or a retired enthusiast with time on his hands or a teenager more interested in stars than twitter not have as much imagination as one who is taking or have tak...

What is the source of the heavier elements that a star "consumes" during the different stages of transformation? Are the stages different between stars with planets and those with no planets? From the debris of a exploded star. the next "generation of solar systems" is born. Do w...

Chris wrote: Again, I disagree with your first assertion. Even a tiny pebble has enough gravity to hold hydrogen to it. It's simply that in most environments, there are other forces that are strong enough to overcome hydrogen's gravitational attraction; basically, it blows away. When we look around ...

Chris wrote: I don't know what "complex" or "simple" mean in terms of matter. I don't think dark matter can in any sense be considered an element. "Element" has a specific meaning, that of an atom comprised of protons, neutrons, and electrons. It seems nearly certain th...

ErnieM wrote: Then as often happens, the best explanation is the simplest. There are no missing galaxies. There is simply not enough material in the region to form any more galaxy than what is there and in this region, the ratio of dark matter is much higher than expected. Chris wrote: Very likely....

ErnieM wrote: What if the stars in these "missing" galaxies were the "short lived super giants" that have long ago turned into black holes or chunks of exploded cosmological debris? Maybe regions of mostly dark matter and little visible matter is not so uncommon after all. Human...

From the post by neufer: Studies of Abell 520 are causing astronomers to think twice about our current understanding of dark matter. Initial observations found dark matter and hot gas, but lacked luminous galaxies – which are normally detected in the same regions as dark matter concentrations. Attem...

After wathing this video http://www.youtube.com/watch?v=KHSZcSowpgg titled Largest Black Holes in the Universe a few questions came to me: Is a black hole(s) always present in the center of all Quasars and Galaxies of different shapes and sizes? Are black holes a form of dark matter? Are there dark ...

Chris wrote: Colliding particles is one method of creating an energetic system. Because the amount of energy in the Universe is (presumably) a constant, the energy density must have been much higher in the first moments of the Universe. To experimentally test theories that describe the early Univers...

The Big Bang was not an explosion. It produced no fireball, and was not an energetic event that ejected anything. The Big Bang was the formation of the Universe by expansion. Certainly, no existing theory suggests that material could somehow be ejected from the Universe. The Universe is everything....

I think I find the explanation from this link: http://www.sciencemag.org/content/282/5397/2156.1.full The two teams, both of which have members in Europe, Latin America, Australia, and the United States, collected their supernova data with increasing efficiency over the last few years, expecting to ...

From High-Z SN page (link: http://www.cfa.harvard.edu/supernova//newdata/fate.html ) We use Einstein's equations of General Relativity to understand what we see in the Universe. In addition to assuming his theory is right (it sure seems to be everywhere we have be able to measure so far), we do have...

Take you pick. At 7 billions years back both will be very hard to determine.

Chris wrote: I don't understand what you are trying to say here. Why are you concerning yourself with angular momentum? That isn't a factor in the redshift-distance relationship. I agree, it is not a factor in the redshift-distance relationship. My point is: IF angular momentum of both objects are k...

Peterfrederick wrote: ErnieM wrote: Is this the same as saying that distant objects will always be red shifted, never blue shifted? 0=========1=========2=========3==========4==========5==========6 0=========.1=========..2=========...3=========....4=========.....5=========......6 Assuming that object...

Ann wrote: Here's what the image reveals: The hot gas — normal matter — was slowed by a drag force described as the cosmic equivalent of air resistance. But the dark matter was not slowed by this effect, presumably because it does not interact with normal matter, as theory had predicted. So the norm...

The large potion of our view of the whole universe along the plane of the Milky Way is obstructed by the huge bulge and the dust in the galactic arms. Hence our observation is only partial and limited towards the directions vertical to the galactic plane that are free of any obstructions. If there i...

From the link posted by bystander: Data from exploding stars contradicts earlier study pointing to the possible existence of a sibling universe In 2008, a research team led by a NASA scientist announced a startling discovery: Clusters of galaxies far apart from one another appeared to be traveling i...

Ann wrote: Chris wrote: Our center of mass is moving with respect to distant objects, but the individual galaxies that make up the Local Group are, in fact, orbiting around each other semi-chaotically. We are like a cloud of gnats flying around: the cloud has a distinct, ordered movement, but the in...

Chris wrote: No. The orientation and other characteristics of galaxies are independent of each other. Are you saying all galaxies are distinct and unique, that not two galaxies have enough similar properties that makes them to appear traversing space in the same direction and speed? Or that we have ...

Suppose we find two galaxies whose galactic planes are parallel to the Milky Way galactic plane. Further suppose that all three galaxies are roughly the same class, type and mass and have the same intrinsic directional spin. Can we than assume that all three galaxies are travelling in space at the s...

ErnieM wrote: Is this the same as saying that distant objects will always be red shifted, never blue shifted? 0=========1=========2=========3==========4==========5==========6 0=========.1=========..2=========...3=========....4=========.....5=========......6 Assuming that objects on space between po...

Chris wrote:

The farther away an object, the farther back in time we see it.

Is this the same as saying that distant objects will always be red shifted, never blue shifted?