After the Sun’s core hydrogen is depleted by nuclear fusion, 

As a one-solar mass star evolves into a red giant, 

When a star becomes a red giant it becomes brighter because 

The event that marks the end of a star’s evolutionary life just before 

The source of pressure that makes a white dwarf stable is

In a white dwarf the mass of the sun is packed into the volume of a planet the size of 

Which of these stars will end its main sequence lifetime most rapidly? 

Astronomers determine the age of star clusters by observing the luminosity of stars 

Which of the following stars is probably the oldest? 

In a young star cluster, when more massive stars are evolving into red giants, 

If one star of a binary fills its Roche lobe and its spilling matter onto the other, 

A star will spend most of its shining lifetime in 

What inevitably forces a star like the sun to evolve away from being a main sequence star? 

In the evolution of massive stars, what is the significance of the temperature 600 million K? 

Stars like our Sun will end their lives as 

A _______ is a relatively gentle mass loss event which allows a star to peacefully readjust its structure into a white dwarf configuration. 

Elements heavier than Hydrogen and helium were created by 

The helium flash occurs in the 

Stars like our Sun gradually lose mass as they become white dwarfs 

Astronomers determine the age of star clusters by observing the 

IF AN INTERSTELLAR CLOUD CONTRACTS TO BECOME A STAR, IT IS DUE TO WHICH FORCE: 

The factors that tend to hinder the collapsing of a gas cloud are:

How do single stars form within huge clouds of interstellar gas and dust? 

 Our sun, along with most stars in the neighborhood probably formed about 

 In the collapsing cloud fragment stage of star formation the size of the cloud fragment is about: 

 What is the key factor that determines the temperature, radius, density, luminosity, and pace of evolution of a protostar? 

 A cloud fragment too small to form a star becomes: 

  As a protostar first beings to condense form dust and gas clouds, it emits light primarily in what wavelength regime? 

Evidence for an association between interstellar dust and star formation comes from 

We know that low mass protostars have strong stellar winds because 

The nebulae around T Tauri stars are shaped into disks because of the same process that causes 

What makes star clusters almost ideal laboratories for studying stars?

What is a T-Tauri star?

Objects more massive than our Sun form into stars much faster,  

Stars are often born within groups known as 

All stars in a stellar cluster have roughly the same _______ with respect to the Sun? 

Very young stars in small clusters of 10-100 members are known as 

Globular clusters are typically observed above or below the plane 

Stars in cluster and associations have about the same  

A key feature of globular clusters is that they have the 

If an interstellar cloud contracts to become a star, it is due to which force? 

What is the most important property of a star that determines how it will evolve and die? 

What is the temperature hydrogen needs to turn into helium? 

 A nova involves: 

An iron core cannot support a star because: 

Most of the energy of a supernova is carried outward via a flood of 

What is the Chandrasekhar limit? 

What type of supernova results from carbon detonation involving a white dwarf gaining mass and exceeding the Chandrasekhar limit? 

Many millisecond pulsars lie within 

One possible explanation for a gamma-ray burster is collision of neutron stars 

What kind of remnant disappears from the directly observable universe? 

The region around a black hole from which no radiation can escape is called 

What explanation does general relativity provide for gravity? 

The force of gravity can pull on a beam of 

If the sun was replaced by a one-solar mass black hole Earth’s orbit 

Cygnus X-1 is a likely 

Some examples of which type of during star exhibit rapid pulses that were originally suspected to be communications from extraterrestrials? 

The average density of neutron stars approaches about 10^17 kg/m^3, 

. Pulsars usually show all of the following except 

The lighthouse model explain a rotating neutron star generates an 

Many millisecond pulsars lie within 

What is the final fate of the most massive stars? 

 The event horizon of a black hole is measured by