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What do active galaxies differ from normal galaxies?
Galaxies that emit much more radiation (different types of radiation) than a typical galaxy. This actually happens in the galaxy's center, so it's more accurate to talk about an active galactic nucleus. The active galactic nucleus is believed to be caused by a black hole. From Wikipedia: " The radiation from AGN is believed to be a result of accretion of mass by a supermassive black hole at the centre of its host galaxy."
The visible part of distant galaxies is the galaxies what?
The "nucleus".
Do only spiral galaxies emit bipolar jets?
Consider the giant elliptical galaxy M87, it has a very small, bright nucleus and a visible jet of matter 1800 PC long racing out of its core. Radio observations show that the nucleus must be no mre than a light week in diameter.
What is an active galactic nucleus?
An active galactic nucleus is a compact region at the centre of a galaxy which has a higher than normal luminosity over a portion of the electromagnetic spectrum.
What is a young galaxy with a giant black hole in the center called?
quasar
Do galaxies all have the same shape?
Galaxies may have any of four general shapes. Elliptical galaxies show little or no structure and vary in general shape from moderately flat and round or oval to spherical. Spiral galaxies have a small, bright central region, or nucleus, and arms that come out of the nucleus and wind around, trailing off like a giant pinwheel. In barred spiral galaxies, the arms extend sideways in a short straight line before turning off into the spiral shape. Both kinds of spiral systems are flat. Irregular galaxies are usually rather small and do not have a symmetrical shape.
How long does it take the sun to complete one orbit around the galactic nucleus?
Astronomers tell us between 225,000 and 250,000 years.
How far does the sun lie from the milky way's nucleus?
The sun is 30'000 light years from the central galactic point.
How is it possible that galaxies in your local group still remain to be discovered?
Galaxies in the local group can still be discovered because they may be small, dim, or obscured by dust, making them harder to detect. Additionally, new technologies and techniques are constantly being developed, which may lead to the discovery of previously unknown galaxies.
What is the type of galaxy that has a nucleus of bright stars with arms that circles around it?
All types of galaxies have a core with a high star density. All galaxies with "arms" are called Spiral Galaxies, of which there are sub-types related to the shape of the arms.
How does the structure of the Milky Way Galaxy change over time?
The stars in the spiral arms gradually rotate around the galactic nucleus
What is a BL Lac object?
A BL Lac object is a term used in astronomy for a type of active galaxy with an active galactic nucleus.
