Earth and Space Science Ch 29

T/F: The formation of a star begins with a cloud of interstellar gas and dust called nebula.

What are cooler areas on the surface of the photosphere that appear darker than other areas

What is the brightness of an object if it were placed at a distance of 10 parsecs

Considering the polarity of the Sun's magnetic field, the solar activity cycle lasts _______.

The apparent shift in a star’s position caused by the motion of the observer is called ____.

T/F: Scientists get evidence about the Sun by directly sampling material from the Sun.

Starting at the center, which is the correct order of solar layers?

T/F: A nebula collapses on itself as a result of its high temperature.

The Sun has the following composition:

Astronomers can identify binary stars by

What is the lowest layer of the Sun's surface from which most of the light emitted from the Sun

T/F: The density of gas in coronal holes is greater than the density of the entire corona.

The ____ of a star determines its temperature, luminosity, and diameter.

Most of the light emitted by the Sun comes from the ____.

T/F: When hydrogen nuclei fuse, they produce helium.

Use the table to calculate which of the following units represents the greatest distance.

Which is true about the spectral classification system of stars?

What is the energy output from the surface of a star - per second

What is the combining of lightweight nuclei into heavier nuclei

Scientists measure distances to stars and observe how stars interact with one another to _____

Ursa Major, which contains the big dipper, is an example of a

Which correctly lists objects in order of decreasing mass?

What are arcs of gas ejected from the photosphere

T/F: A new star often illuminates the gas and dust surrounding it.

What is the Ancient Greek classification system based on how bright a star appears to be

T/F: Stars more massive than the Sun use up their fuel at a slower rate.

Which point on the timeline most correctly identifies the Sun’s current point in its lifecycle?

The fact that nearby stars shift in position as observed from Earth, is called ___________?

What is the outermost layer of the Sun's atmosphere, having a temperature of about 1 million K?

A star that is gravitationally bound to another star can be part of a star cluster or a ____.

T/F: The greatest proportion of elements in the universe are those with the smallest masses.

A star that starts with more than about 20 times the Sun’s mass will

The ____ of a star determines its temperature, luminosity, and diameter.

Why is the Sun's composition similar to that of the gas giant planets?

What is the section of the H-R diagram into which about 90% of the stars fall

T/F: A parsec is a greater distance than a light year.

T/F: The state of matter found in the Sun’s interior is plasma.

What causes the dark bands observed in a solar spectrum?

When comparing properties of stars the most variation in data is the stars’__________.

Which planet has composition and density most similar to the Sun?

During a supernova,

How is the Sun's magnetic behavior associated with its activity cycle?

The outward flow of charged particles from the Sun's corona flowing throughout the solar system

What are areas of low density in the gas of the corona from which particles escape

What are violent eruptions of particles and radiation from the surface of the Sun

T/F: As a star ages, its internal composition changes as a result of rising temperature.

What is visible light arranged according to wavelengths

What is the minimum to maximum sunspots, a reversal of polarity over a period of 22 years

Using parallax, note the greatest shift in a star’s apparent position measured ________.

Which is NOT true about binary stars?

T/F: A nebula' s rotation forces it into a disk shape with a hot condensed object at the center

What is a small, massive, dense object that has a gravity so immense-not even light-can escape

T/F: The Sun is almost entirely composed of hydrogen and helium.

When estimating the distance of stars, astronomers use the observed shift in position, known as

What is the unit of measurement used to express the energy emitted per second

Constellations are __________