F
the star scientists study the most
sun
refers to the total amount of energy (light) emitted by star at its surface
luminosity
small and medium sized stars
dwarf stars
How many planetary systems does the Sun have?
eight
What is the planetary system closest to the Sun?
Mercury
the sun is made of what elements?
hydrogen, helium, and other elements
What is the color of the Sun?
Yellow
Stars, including the Sun, go through various stages of stellar evolution. The Sun is in what evolutionary stage?
Main sequence
Why do planets orbit/revolve around the Sun?
because of the gravitational pull exerted by the Sun
What is the core temperature of the Sun?
millions of degree Celsius
it is the closest star to the sun
Proxima Centauri
Stars, including the Sun, are primarily composed of hydrogen and helium with trace amounts of other elements. How many percent is helium?
24%
What is the estimated total lifespan of a star?
10 billion years
These are celestial objects that emit light and heat due to nuclear reactions occurring in their cores.
Stars
What is the relation of mass of the star to its lifespan?
More massive stars have shorter lifespans, while less massive stars can live for much longer
process by which the sun makes its own light or generate its energy
nuclear fusion
Stars, including the Sun, are primarily composed of hydrogen and helium with trace amounts of other elements. How many percent is hydrogen?
74%
What is the relation of size of the star to its lifespan?
the larger it is, the shorter its lifespan
scientific study of celestial objects, such as stars, planets, galaxies, and other phenomena that exist outside Earth's atmosphere.
Astronomy
it is the final evolutionary stage of low intermediate mass stars.
White dwarf star
What color of the star is the COOLEST?
red
What is the size of the Sun?
Medium-sized
What is surface temperature of the Sun?
5,500 degrees Celsius
Scientist who used telescopes to observe celestial bodies, discovered the four largest moons of Jupiter, and observed the phases of Venus, supporting the heliocentric model
Galileo Galilei
stars enter this evolutionary stage once they have exhausted the hydrogen fuel in their core and have started to burn helium and other heavy elements.
red giant and supergiant stars