Star

The Sun has a temperature of 6,500 K. Based on the table, what color is the Sun?

• Blue

• Blue-White

• Yellow

• Yellow-White

Star B has a temperature of 25,500 K. Based on the table, what color is Star B?

• Blue

• Red

• Yellow

• white

Sara examined several photos of stars to compare their temperatures. She organized the photos from COOLEST to HOTTEST. Which of these is correct?

• red, yellow, white, blue

• white, red, yellow, blue

• yellow, white, blue, red

• blue, yellow, white, red

Which of the following correctly defines apparent brightness of a star?

• The brightness of a star as seen from various distances.

• The brightness of a star compared to the Sun.

• The true brightness of a star at a standard distance.

• The brightness of a star as seen from Earth.

Based on the chart, which star has the greatest absolute brightness?

• Rigel

• Sirius

• Betelgeuse

• Aldebaran

What causes the interstellar clouds to collapse to form proto-stars & stars?

• centripetal forces that act over large areas between stars

• a contraction & clumping of gas/dust due to gravity

• a contraction & clumping of gas/dust due to frictional force

• a "trigger" mechanism such as two colliding stars

Eventually a "snowball effect" occurs in a contracting gas/dust cloud which causes

• material to slowly build up into one or more proto-stars.

• a cascading avalanche of star material spreading everywhere.

• massive clumps of ice/snow to form.

• a net effect of negatively charged explosive plasma/ions.

When enough mass is accreted by a proto-star then ____ occurs at the core.

• atomic reactions

• nuclear fusion

• massive pressure

• nuclear fission

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8

What happens when a proto-star begins the hydrogen/fusion energy process in its core?

• mayhem & destruction ensues

• the proto-star becomes (officially) a real star

• no one really knows since it hasn't been observed (yet)

• the proto-star may explode due to the outward pressure

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8

It is now thought that most (if not all) stars formed

• very very slowly.

• mostly within the interstellar medium.

• in clusters within nebula clouds.

• in binary systems.

Tags

NGSS.HS-ESS1-3