Which statement regarding deuterium is false?

Spherical aberration is a problem in ________________ telescopes and refers to __________________.

What parameters must be equal to obtain hydrostatic equilibrium? (Choose all correct answers),,

Which statement is false:

Only fully formed stars are found on the main-sequence. Protosuns are not.

At mid-northern latitudes (California), the full moon passes higher in the sky in winter than in summer.

Ages of open star clusters can be determined by the length of their Main Sequence stars. If an open cluster has a few blue stars and many white, yellow & red dwarfs, what is the age?

Continuous radiation (a stellar spectrum) from the photosphere of a star is called a blackbody curve. If a star has a surface temperature four times higher than that of our Sun, what is the most-likely color of the star?

To calculate the distance a star is from us, we measure the apparent magnitude and compare it to the absolute magnitude of the star. We know that the intensity, I, diminishes with increased distance, D, (I is inversely proportional to D2). Identify an object for which we know the absolute magnitude.

Massive stars live significantly longer lives than low-mass stars, since they have much more fuel available to them

Every star emits "black body" radiation described by Wein's Law: At the peak radiation, the wavelength is inversely proportional to:

What subatomic particles are found in an atomic nucleus? Mark all the correct answers.,,

Which one of the following statements about the birth of stars is false?

How many neutrons are in the nucleus of isotope ? Oxygen 18 is used to determine how much of the world's oceans were frozen during past ice ages.

Inverse square law: If Stars Fred and Ernie have the same apparent brightness, but Star Fred is 4 times farther away from Earth than Star Ernie, then Star Ernie's luminosity (absolute magnitude) is _________ times the luminosity of Star Fred. o Earth * Ernie * Fred

When we see other people, our eyes are detecting the visible light that each of us radiates as an approximate "blackbody" (thermal emitter).

The star Sirius has a brighter apparent magnitude than its absolute magnitude. Which statement is correct?

Jovian planets have rings because

The luminosity of a massive main-sequence stars are greater than those of low-mass main-sequence stars.

Which planet's orbit is elliptical enough that the seasons are not equal in length?

If the spectrum of Star Amy peaks at optical wavelengths, and Star Johnny's surface is twice as hot as Amy's surface, then Johnny's spectrum peaks in the ultraviolet.

Which statement is false:

The resolution (clarity) of images obtained with large ground-based optical telescopes is generally degraded by turbulence in Earth's atmosphere, unless special correction techniques are used.

If the spectral lines are shifted in color toward longer wavelengths, we can derive the speed of an astronomical object:

Which kind of star clusters have a few hundred stars and are located primarily in the galactic disk?

During times of sunspot maximum, an unusually large number of prominences, solar flares, and coronal mass ejections also occur on the Sun.

Which one the the following statements about atoms is false?

The type of spectral feature, usually observed from a hot gas without a star behind it, is an absorbtion line.

The oscillating brightness light curves of RR Lyrae and Cepheid Variable stars identify known absolute magnitudes for these stars; so we can compare absolute and apparent magnitudes to estimate a star's ________.

When an atomic electron drops from a higher energy state to a lower energy state, it emits

Thoroughly studying certain types of binary stars in the main way in which astronomers directly measure stellar masses.

The 11-year sunspot cycle is driven by:

Which celestial body has a retrograde rotation?

Which fusion process occurs in our Sun?

Isotopes are atoms:

Protostars are born when:

Brown dwarfs are formed by the same initial process that forms main-sequence stars, but they are less massive.

An astrometric binary pair is identified by:

The Sun doesn't have a perfect blackbody spectrum because

In some cases, radio telescopes at many different locations have been used together, combining the light, to produce images with much higher resolution than that of the individual telescopes

Suppose exoplanets Luke and Leia both orbit the same star. The orbital period of exoplanet Luke is five times longer than that of exoplanet Leia. Compared with exoplanet Luke, exoplanet Leia is _________ to its star.

The retrograde motion of Pluto can be attributed to the relatively high eccentricity of its orbit around the Sun, as compared normal planets.

Per photon, ultraviolet photons have more energy than radio photons

A binary star that varies in apparent brightness as one member of the binary passes in front of the other is

The solar activity cycle has a period of about 11 years, including the magnetic pole reversal.

In a vacuum, photons of higher energy:

Stars generate their energy through nuclear fission, the breaking apart of unstable, heavy elements into lighter ones.

Which pair of scientific notation match 0.004 5 32,000