Final Pt 2 Flashcards
There are 3 components to a telescope, the telescope which collects ___ ___, the instrument that sorts the incoming radiation by _____, and the device that senses the radiation in wavelength regions we choose and ____ it
visible light, wavelength, records
The most important functions of the telescope are to ___ the faint light from an astronomical source, and to ___ all the light into a point or an image
collect, focus
In a ____ telescope, the light travels through a lens and is focused to a point, while in a ____ telescope, the a mirror focuses the light to a point. These telescopes are also ____.
refractor, reflector, bigger
angular resolution is the ability to distinguish ____ ____ from one another. The higher the resolution, the more we are able to make out ____ ___ and the more ____ we can see.
separate objects, distinct objects, detail
____ causes rays of light from a star to dance around as they reach a telescope. ___ ____ makes the telescope mirrors do an opposite dance, ____ out the atmospheric distortions. The ____ of the mirror is changed slightly many times each second to compensate for the logically changing atmospheric distortions.
turbulence, adaptive optics, cancelling, shape
The ___ ____ was an attempt to communicate with potential extraterrestrial life by ____ bits of data transmitted from a ____ telescope toward the global cluster ____, _______ light years away.
arecibo message, 1679, radio, messier, 13-25,000
The FAST telescope is a ____ telescope in China that is bigger than ____
radio, arecibo
Radio interferometry uses _____ telescopes together, to achieve a high ____ ____.
multiple angular resolution
an interferometer measures the ___ __ produced by multiple ____ like a 2 slit experiment. The signals arrive at the antennas at slightly different _____ depending on the antenna’s location in the array. The signal from each antenna is _____ with that from every other in the correlator and the ___ is compensated for in software.
interference pattern, apertures, times, combined, delay
the theory that any well behaved signal can be expressed as the sum of sinusoids
fourier theory
Direct imaging is difficult because you’re trying to see something very ___ just beside something very ____. Thus, ___ methods have been far more succesful
faint, bright, indirect
Newton came up with the theory that every mass attracts every other mass through the force called ____, the the strength of this force is directly proportional to the product of their ___.
gravity, masses
Newton predicted that earth’s gravity extends to the moon and produces the force requires to ___ the moon’s path from a ___ ___ and keep it in its ____. Similarly, the attractive force between the __ and each of the planets could keep them in their orbits
curve, straight line, orbit, sun
The discrepancies in _____ orbit helped find ____. This demonstrated that you can measure the ___ of planets as they go around the sun to see if another planet is ___ it along. No changes means there are ___ other planets nearby.
uranus’, neptune, schedule, tugging, no
mercury orbits the sun with a shorter ___ so errors can build up fast. The ___ __ ___ gives us an estimate of the ___ of the star.
period, general relativity correction, mass
An optical effect seen in stars and planets where the central part of the disk appears brighter than the edge or limb
limb darkening
If there is just the planet and the star, the transits will come like ____. With additional planets, the transits come ____ or ____ depending on the ____ of the planets and their _____
clockwork, earlier, later, position, masses
The star and the planet orbit around their common _____. The stellar motion, induced by the gravitational perturbation of the planet, is called ___ ___. The center of mass of the solar system is ____ due to ____
barycenter, reflex motion,offset, jupiter,
In radial velocity, the light from the star with the star’s ___ ___ passes through a chamber with a ____, to see how much the absorption lines has ___. To reliably measure small motions of a star around it’s barycenter, you must first remove motions of the ____
absorption spectrum, gas, shifted, earth
The difference in brightness between the earth and the sun is ~____ magnitudes, which ___ be observed with current technology, but there is the problem of trying to keep the star’s light from ____ you to the planet
25, can, blinding
HR 8799 is part of a system that also contains a ____ ___ and at least ___ massive planets. These planets were the first exoplanets who’s ____ ___ was confirmed by direct imaging. They are 4 ____ ___ orbiting with periods that range from ____ to ____. 7 images were taken in infrared light at the Keck telescope with ___ _____ across 2009-2016
debris disk, 4, orbital motion, super jupiters, decades, centuries, adaptive optics
A coronograph is a telescope that is designed to block light coming from the ___ ___ in order to see the extremely faint emission from the region around the sun called the _____.
solar disk, corona
Protoplanetary disks can be a problem for detecting the ___ and ___ of exoplanets due to ____.
growth development, exoplanets, dust
______ light is dust that accumulates along the solar system coming from the faint flow of ___ ___ scattered by interplanetary dust. The ____ _____ from this is likely to be the largest source of ___ ____ in direct observations of terrestrial planets in habitable zones of nearby stars.
zodiacal, diffuse sunlight, background flux, astrophysical noise
