Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Astronomy 3L > Quiz 3 > Flashcards

Quiz 3 Flashcards

1
Q

Collects first star catalogue, considered the greatest astronomical observer using Babylonian star records and accurate models of the motion of the sun and moon. Developed trigonometry

A

Hipparchus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Assigned magnitude of 1-2 brightest stars (metal plate), and divided visible stars into six magnitude classes

A

Hipparchus making the first determinations of stellar magnitude

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

System expanded and improved, still the basis of techniques used today

A

Parsons ratio

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Observed from earth, negative is brightest

A

Apparent brightness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

NGC 224, spiral 2.5m ly away from earth, trillion stars, Milky Way mass. Black hole nuclear 3-5 x 10^7. Moving to MW at 301 km/s. Will collide in 3.75 b years

A

M31 in andromeda

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Three parts: disk, nuclear bulge, globular clouds

A

Spiral galaxy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

20%, m31, Milky Way, m 33. type of galaxy. Subdivide to barred and regular

A

Spiral galaxy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Type of galaxy, 55%

A

Elliptical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Type of galaxy, 25% Small Magellanic Cloud

A

Irregular

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Demonstrated universe was expanding

A

Hubble and humason

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Observed the effects of dark matter in galaxy clusters

A

Zwicky

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Supply verification of dark tater with galactic rotation curve

A

Vera Rubin and Kent ford

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Should decrease as a function of radius but doesn’t

A

Galactic rotation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Additional source of gravity around galaxies that don’t make light. has to be taken into account when determining mass

A

Dark matter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Expanding and accelerating. Led to noble peace prize and the rehabilitation of Einstein’s cosmological constant

A

Universe

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Method of categorizing galaxies, elliptical/irregular to spirals. Not evolutionary. Discovered by Hubble

A

Tuning fork

17
Q

Stars and gas orbit in an overall gravitational field, while stars in Ellipticals orbit to maintain shape.

A

Orbiting

18
Q

Orbit to maintain shape, center has a supermassive black hole. Hot gas

A

Elliptical

19
Q

Cold gas, supermassive black hole

A

Spiral

20
Q

Can help find distances in our galaxy to other galaxies. Bound collections of up to a million stars. Luminous and can be seen at great distances. Medium black hole centers. Very old stars.

A

Globular cluster

21
Q

Uses up hydrogen, shows age

A

Main sequence turn off

22
Q

Used globular clusters to find the size of our galaxy and observed our sun isn’t near the center.

A

Shapley

23
Q

Specifies each point on a plane by two coordinates

A

Cartesian coordinate system

24
Q

Distance from the y axis is scaled with the x axis

A

Abscissa

25
Q

The y coordinate

A

Ordinate

26
Q

System of gas, dust, stars with their solar systems

A

Galaxy

27
Q

All points of a moving body moving in the same direction

A

Translational motion

28
Q

All points of an object circle around an axis

A

Rotational motion

29
Q

The squares of the orbital periods of the planets are directly proportional to the cubes of the semi major axes of their orbits

A

Keplers third law

30
Q

Astronomical objects that make up the rungs of the cosmic distance ladder: tool for measuring distances. Made of cepheids

A

Standard candle

31
Q

Astronomical method for measuring distances to stars. Applied to any main sequence star a spectrum can be recorded for, doesn’t rely on parallax

A

Spectroscopic parallax

32
Q

First to realize the Milky Way galaxy was larger than believed, took photographs and observed globular clusters, compact spheres composed of many thousands of stars

A

Harlow Shapley

33
Q

Studied solar eclipses, argued there were galaxies outside the Milky Way. Debated with Shapley over the size of the universe

A

Heber Curtis

Astronomy 3L (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions