Star Formation
This stage occurs before nuclear fusion begins and the object is still contracting under gravity.
What is a protostar?
Stars with greater mass burn their fuel at a ___ rate.
This balance of gravity and outward pressure keeps main sequence stars stable.
What is hydrostatic equilibrium?
Which star type is cooler: red dwarfs or supergiants?
What are red dwarfs?
Young stars that have cleared away surrounding dust and show brightness fluctuations are called these.
What are T Tauri stars?
A star similar to the Sun will stay on the main sequence for approximately this long.
What is about 10 billion years
White dwarfs are extremely dense because they contain roughly the mass of the Sun in an object about this size.
What is about the size of Earth
These stars are the most common stars in the Milky Way.
What are red dwarfs?
Planets form from this rotating disk of gas and dust around a young star.
What is a protoplanetary disk?
These small stars can burn hydrogen for trillions of years because their fuel mixes throughout the star.
What are red dwarfs?
A teaspoon of white dwarf material would weigh approximately this much.
What are about 100 tons
Which burns fuel faster: a high-mass star or a low-mass star?
What is a High-mass star?
As a gas cloud collapses to form a star, gravitational potential energy is converted into this form of energy.
What is thermal (heat) energy?
Stars with masses between about 10–70 solar masses are classified as these.
What are supergiant stars?
Neutron stars form when the core of a massive star collapses and this stellar explosion occurs.
What is a supernova?
This star type represents the final stage for stars similar to our Sun.
What is a white dwarf?
A brown dwarf forms like a star but never reaches the temperature needed for this process.
What is hydrogen fusion?
Brown dwarfs have masses between about these two values of Jupiter masses.
What are 10–90 Jupiter masses?
In a neutron star, protons and electrons combine to form this particle.
What is a neutron?
This stellar object has gravity about 2 billion times stronger than Earth's.
What is a neutron star?
A star similar to the Sun runs out of hydrogen fuel, expands into a red giant, sheds its outer layers, and leaves behind a dense core. What object remains?
What is a White dwarf?