ASTR152 Checkpoint #8

the explosion of a massive star when the fusion of Iron leads to the collapse of its core

Although centuries ago, astronomers though that a nova was a new star, appearing for the first time in the heavens, today we know that it is:

The O and B type stars

As a cluster of stars begins to age, which type of star will move off the main sequence of the H-R diagram first?

rotating neutron stars

Astronomers have concluded that pulsars are

When nuclear fusion reactions began inside its core

Astronomers identify the "birth" of a real star (as opposed to activities of protostars) with what activity in the star?

a supernova explosion

Elements heavier than Iron (Fe) can only be created during:

Herbig-Haro

HH objects are luminous knots of gas in an area of star formation that are set to glow by jets of material from a protostar

orbited so close to its star it took only 4 days to go around

The big surprise about the first planet discovered around another (living) star was that it

Three Helium nuclei begin fusing Carbon (element number 6)

When the core of a star reaches a temperature of about 100 million degrees (K), something new happens in the core. What is this new event?

K

Which of the following types of stars will spend the longest time (the greatest number of years) on the main sequence? K O G you can't fool me; every star spends the same number of years A

molecular clouds

______________ are large, cold interstellar clouds with diameters of dozens of light-years and typical masses of 105 solar masses; found in the spiral arms of galaxies, these clouds are where stars form.