The greater the distance to a galaxy, faster it is moving away from us Most of the mass of the milky way exists in the form of Orbit faster than expected based on the galactic mass we can see Stars in the outermost regions of the milky way How long is a year on Pluto? (40 AU from sun)Ī star blows up, releasing 1.8x10^47 J of energy. Tripling the diameter of a telescope with angular resolution of 1 arcsecond makes the angular resolution:įind mass of a black hole given we see a star orbit it once a year, at a distance of 10 AU (keppler's law: M=A^3/P^2Ī star has a parallax of. What information does the cosmic background radiation give us?Ī picture of the sizes of early dark matter-shrouded galaxies, and a measure of the temperature of the present universe (2.7 K) Why is this? They could not have communicated because it would have taken 28 billion years and that is older than the universe itself. The universe is similar in both ways from us, 14 billion years each way. If two laser pointers sent out two parallel beams into space, they would ultimately cross at The early universe was expanding more slowly than it is now What do data points near region C refer to?įact that the data falls below the straight lines near region C means that What do data points near region A refer to? Very broad, indicating that their source is undergoing rapid internal motion (in more than one direction) Usually have jets and accretion disks, with a black hole at the center It is highly variable, indicating that the emission source is very compact (> a parsec in size) *what is special about the energy output of an AGN? *What is special about the emission spectra coming from AGNs? Greater than 10^37 W, which means they consumer on average on sun's mass every couple of years. *What are typical values of luminosity in AGNs? What is a proposed explanation for gamma ray bursters?Ī hypernova making black holes and bi-polar jets The location of a super massive black hole at the center of the Milky WayĪndromeda, Sagittarius drawf, large and small magellanic clouds, milky way, and other neighbors What kind of stars are used as "standard candles" to estimate the distances to star clusters in the Milky Way? Noting the turnoff mass in a star cluster on an H-R diagram allows you to determine its It could be:Ī supernova in the Milky Way or some distant galaxyĮlusive particles created by the sun that allow astronomers to determine what nuclear fusion reaction powers itĪny size, as long as all the mass is within the Schwarzschild radius for that mass value Signals from a rapidly spinning neutron starĪn old star cluster in the Halo of the milky way is generally aĪ new, star-like object appears to have magnitude -10 M. If you were to see signals coming into your radio telescope receiver, you'd think you were seeing It will have a helium flash and move into the horizontal branch of the H-R diagram What is the last and heaviest element that can be created from fusion in the normal evolution of a high-mass star? What balances the sun's huge gravitational force, keeping it from collapsing? That any object at any temperature above absolute zero will emit a characteristic distribution of wave lengths of light Increasing the diameter of a telescope primary lens: Main sequence stars, black holes, neutron stars, red giants, and white dwarfs Which planet has the largest magnetic field? What is the most important parameter that determines the behavior of star? What would you use to image very cold clouds containing atomic hydrogen? Of these stars, which is coolest: red, yellow, green, dark red The moon's orbit around earth is not exactly circular Why do we see both total and annular solar eclipses? How many high tides are there in a day on average?
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