GIZMO H R DIAGRAM
SCIENCE WORK
SHEET LATEST
UPDATE 2025 GRADED
A+.
TUTOR25
, Student Exploration: H-R Diagram
Vocabulary: giant, H-R diagram, luminosity, main sequence, star, supergiant, white dwarf
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. The image at left shows three stars in the constellation
Orion: Betelgeuse (A), Mintaka (B), and Rigel (C). How do
the appearances of stars A, B, and C compare?
Star C is larger than stars A and B and Star A is a
different color then stars B and C.
2. What are some ways the stars in the photo could be grouped
or classified?
Stars can be classified by color, size and luminosity
(brightness)
Gizmo Warm-up
In the early 1900s, astronomers identified many star
characteristics such as color, size, temperature, and luminosity
—or how bright a star is. Using the H-R Diagram Gizmo, you will
discover how some of these characteristics are related.
Start by moving your cursor over the stars in the Star
collection. Star information is displayed on the right side of the
Gizmo. The numbers given for Luminosity, Radius, and Mass
are in comparison to the Sun. So, a star with a radius of “2
Suns” is twice as large as the Sun. Temperature is given using
the Kelvin scale, where 273.15 K = 0 °C and 373.15 K = 100 °C.
1. Find Betelgeuse in the Star collection. Fill out the Betelgeuse
chart at right. Temperature
3,400 K
Luminosity
2. The Sun has a radius of 695,500 km. Radius
What is the radius of Betelgeuse? 383.4 million mi Mass
2019
SCIENCE WORK
SHEET LATEST
UPDATE 2025 GRADED
A+.
TUTOR25
, Student Exploration: H-R Diagram
Vocabulary: giant, H-R diagram, luminosity, main sequence, star, supergiant, white dwarf
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. The image at left shows three stars in the constellation
Orion: Betelgeuse (A), Mintaka (B), and Rigel (C). How do
the appearances of stars A, B, and C compare?
Star C is larger than stars A and B and Star A is a
different color then stars B and C.
2. What are some ways the stars in the photo could be grouped
or classified?
Stars can be classified by color, size and luminosity
(brightness)
Gizmo Warm-up
In the early 1900s, astronomers identified many star
characteristics such as color, size, temperature, and luminosity
—or how bright a star is. Using the H-R Diagram Gizmo, you will
discover how some of these characteristics are related.
Start by moving your cursor over the stars in the Star
collection. Star information is displayed on the right side of the
Gizmo. The numbers given for Luminosity, Radius, and Mass
are in comparison to the Sun. So, a star with a radius of “2
Suns” is twice as large as the Sun. Temperature is given using
the Kelvin scale, where 273.15 K = 0 °C and 373.15 K = 100 °C.
1. Find Betelgeuse in the Star collection. Fill out the Betelgeuse
chart at right. Temperature
3,400 K
Luminosity
2. The Sun has a radius of 695,500 km. Radius
What is the radius of Betelgeuse? 383.4 million mi Mass
2019
