OCR Stars

All stars begin their life as a low density cloud of dust and gas known as a ....

• Main Sequence Star

• Nebula

• Protostar

• Black Dwarf

Which life-cycle stage follows the end of Main Sequence for a star which is 20 times more massive than the Sun?

• White Dwarf

• Blue Supergiant

• Red Supergiant

• Red Giant

In which stage will a star be most dense?

• Neutron Star

• Main Sequence

• Protostar

• Nebula

What is the heaviest element fused during the Red Supergiant phase within the cores of the most massive stars

• Helium (He)

• Iron (Fe)

• Carbon (C)

• Plutonium (Pu)

What is the best description for a Red Giant?

• A large, luminous, cool star

• A small, extremely luminous, hot star

• A small, low luminosity, cool star

• A large, luminous and hot star

What do we call the threshold value which determines whether a star will become a white dwarf, or a supernova?

• Degeneracy limit

• Hertzsprung-Russel constant

• Supernova determination constant

• Chandrasekhar limit

What is a comet?

• Large rocky ball of ice that orbits the sun

• Cluster of billions of stars

• Lumps of rock or iron that orbit the sun

• Minor planets

What is the reason a Main sequence star is so stable?

• The number of atoms remain the same

• The 'radiation pressure' balances the force of weight

• Magnetic forces within it hold it together

• It has plenty of emotional support from it's friends

What is the best description for a White Dwarf?

• A large, luminous, cool star

• A small, low luminosity, hot star

• A small, low luminosity, cool star

• A large, luminous and hot star

What is the name of the gas/dust clouds that form stars?

• Nebulas
• Protostars 
• Supernova
• Neutron Star