Physical Properties of Stars - PartTwo

Physical Properties of Stars - Part Two (Quiz)

Open Ended

Among the 5 stars that you have chosen, what do you think is the best star for you? Explain in a well compose sentence.

Stars incredible because they are light years away from Earth, but yet we can still see their brightness every clear night. All stars have certain properties, or characteristics.

Properties/Characteristics:

1. Brightness - the amount of light the star radiates (luminosity) taking into account its size and distance from Earth (magnitude).

Properties/Characteristics:

2. Color - the star’s color is based on surface temperature: cooler stars are redder, hotter stars are bluer, mid range temperatures are white or yellow.

Properties/Characteristics:

3. Surface Temperature - measured on the Kelvin scale, the coolest reddest stars are around 2,500 K while the hottest stars can reach 50,000 K (The Sun is about 5,500 K).

Properties/Characteristics:


4. Mass - measured in terms of the Sun, called Solar mass. If a star is larger than our Sun, it might have a mass of 7.5 solar masses.

Properties/Characteristics:


5. Size - measured by the Sun’s radius (1 solar radii is the same size as the sun).

Properties/
Characteristics:

Properties/
Characteristics:

Properties/
Characteristics:

​Protostar - how a star begins. It is a bunch of gas that has collapsed from a giant cloud. This phase could last 100,000 years.

Multiple Choice

__________ how a star begins. It is a bunch of gas that has collapsed from a giant cloud. This phase could last 100,000 years.

• Supernova

• Blackhole

• Protostar

• Red Giant Star

​Main Sequence Star - Most stars in our galaxy are main sequence stars, including our Sun. They all convert hydrogen into helium by releasing a lot of energy.

Multiple Choice

__________ Most stars in our galaxy are main sequence stars, including our Sun. They all convert hydrogen into helium by releasing a lot of energy.

• Main Sequence Star

• Red Giant Star

• Protostar

• Blackhole

Properties/Characteristics:

​Neutron - Unlike most stars that become a white dwarf to die, it dies in a 8 supernova explosion and the core that remains is a neutron star. It is made entirely of neutrons.

Multiple Choice

__________ Unlike most stars that become a white dwarf to die, it dies in a 8 supernova explosion and the core that remains is a neutron star. It is made entirely of neutrons.

• Main Sequence Star

• Red Giant Star

• Neutron

• Blackhole

A few things to keep in mind is that one star’s lifetime could be many types of stars and change colors. Over time, a star eventually dies. It may take billions of years, but a star that begins as a dwarf star may change into a supergiant. Each star has a unique life cycle and transition to different stars.

Fill in the blank. Hand out like the image below will be given to you shortly.