if so there must be life out there
2007-11-01 14:42:07 · 14 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
The milky way has a black hole in the middle of it as do all other galaxies. The sun as well as planets revolve around this. Since centripetal force is acting, as when you whirl a yoyo around your head with a string, the planets do not get sucked in. So no, not every galaxy, not even the milky way has a sun/star in the middle of it.
2007-11-01 14:46:52 · answer #1 · answered by Mika 2 · 2⤊ 0⤋
Galaxies are made up of solar systems..which have the suns, sometimes one but it can be two; also black holes and dark matter which we know are there because we can't see them. If there were no dark matter and black holes it would mean that some scientists have got their maths wrong and of course that is quite impossible.does your head hurt yet?
As for their being life out there..why not? But it would need water as well as sunlight in order to exist which is why they get so excited whenever they think they have detected water of some frozen moon or distant planet even though if there is life it is hardly likely to be detectable from so far away and would change absolutely nothing here. When astrophysicists and astronomers start running around shouting eureka, the important thing to remember is that there will still be twelve to a dozen and the neighbour's cat is still going to dig up your flower beds when it wants to.
2007-11-01 15:04:09 · answer #2 · answered by selina.evans 6 · 1⤊ 0⤋
A galaxy is a collection of billions of stars (suns).
A galaxy has a centre called core or nucleus (higher conentration of matter) and most of them, we are now discovering, have a large black hole at the centre.
Our own Galaxy (with a capital G when talking of our own, just like our Sun and our Moon) has a black hole that has a mass equivalent to 4 million times the mass of our Sun. Becasue our Galaxy's centre has less dust and stuff than some other galaxies, it is a quiet black hole.
When matter falls into a black hole, it gets ripped apart before falling in, and the ripping apart generates lots of energy.
Lots.
Even more than that.
We then call such a galactic centre an Active Galactic Nucleus (AGN)
2007-11-01 14:51:25 · answer #3 · answered by Raymond 7 · 2⤊ 0⤋
No - every solar system (of which there are many) has a sun in the middle. At the centre of every galaxy there is BELIEVED to be a black hole.
The existence of a sun doesn't mean there has to be life, just makes it more likely that there is.
2007-11-02 10:31:09 · answer #4 · answered by Ms Minger 3 · 1⤊ 1⤋
Galaxies don't have a sun in the centre. Galaxies have millions of suns near the centre, and most have a supermassive black hole at their centres.
If you look at a picture of a galaxy, you will see billions of stars, in the outer edges, but they get thicker the closer you get to the centre.
There is very little chance of life in the centre of galaxies due to the amount of heat and other radiation from those millions of stars.
2007-11-01 15:02:38 · answer #5 · answered by Anonymous · 2⤊ 0⤋
A galaxy is made up of lots of suns (stars). Current thinking is that a black hole is in the middle of our galaxy.
2007-11-02 01:20:35 · answer #6 · answered by andy muso 6 · 1⤊ 0⤋
I'm sure you mean solar system. And obviously if it is a "solar" system it has a sun. You probably meant does every star have planets? No. But there are to date 249 exosolar planets (outside our solar system) in around 80 systems, detected. they detect them mainly by the gravitational pull they yeild on their sun (a wobble), but some detecting is upon shadows as well. Most are gas giants larger than Jupiter, but not all.
2007-11-01 15:44:37 · answer #7 · answered by primalclaws1974 6 · 2⤊ 0⤋
Galaxies are HUGE............
They contain many thousands of suns, which have many millions of planets orbiting them.
The rocks, minerals and gasses on these planets will not differ from those on this one, so the fact that life has evolved on this planet means that it CERTAINLY has on many similar ones.
Scary eh?
Problem is - the vast distances involved mean that we are unlikely to make contact in the foreseeable future
2007-11-01 14:59:29 · answer #8 · answered by Anti theist 5 · 1⤊ 0⤋
I think your confusing our solar system with our galaxy. Our sun is one star in a galaxy of billions of stars, each one with planets revolving around them.
2007-11-01 15:20:35 · answer #9 · answered by Joe C. 3 · 1⤊ 0⤋
in the center of a galaxy, theres blackholes and lots of stars. so you could say that there are ALOT of suns in the "middle" of our or a galaxy
2007-11-02 09:23:16 · answer #10 · answered by dragonash36 1 · 1⤊ 0⤋