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black holes and galaxies

Across
When looking for extraterrestrial life in the universe, astronomers often look for bodies in space that have this molecule
Describes variable stars that vary in brightness in a repetitive and predictable way
Describes stars whose luminosity changes with time
It is thought that a ____ hole roughly 4 million times more massive than the Sun resides within a few parsecs of the Galactic center
Grouping of several clusters of galaxies into a larger, but not necessarily gravitationally bound, unit
Variable stars whose period is related to its luminosity, so a determination of this period can be used to obtain an estimate of distance
Nearest Galaxy to ours
A huge collection of stellar and interstellar matter isolated in space and bound together by its own gravity
Our galaxy
Dark ___ is of unknown composition
The most luminous objects known; they appear star-like
Near the center of the Galactic disk, the disk thickens and forms this
Down
This type of galaxy has flattened disks, central bulges and arms
Local ____ Galaxy clusters consist of many galaxies orbiting one another,bound together by their own gravity
This type of galaxy does not fit into any of the other categories; many are rich in dust and gas
A roughly spherical ___ of old stars and star clusters surrounds the Galactic disk
This type of galaxy has no disk and contains little or no cool gas or dust, although very hot interstellar gas is observed
Hubble's ____ is around 70 km/s/Mpc
Our galaxy has an invisible _____ halo containing far more mass than can be accounted for in the form of luminous matter
___-spiral galaxies contain an exteded strip of material projecting beyond the central bulge
Dark ___ is hypothesizes to permeate all of space and is related to the expansion of the universe
Star formation is taking place in the _____ arms of our galaxy
Gravitational ___ is the effect induced on the image of a distant object by a massive foreground object
Describes galaxies that are more luminous than normal galaxies and have nonstellar spectra, emitting energy outside the visible spectrum