Good question! Stars are definitely useful
for many different reasons! Let me give you a
few examples… Let’s think about the star that is
closest to earth: the sun. The earth’s surface
gets most of its heat from sunlight. Some of the
heat at the surface actually comes from deep in
the earth, but most is from the sun. If the sun
weren’t around, then it would be too cold for life
to exist on earth. Even if heat from deep in the
earth kept the surface warm enough for there to be
liquid water, photosynthesizing organisms
(green algae and plants) would not be able to live
without sunlight. Here’s another reason why
stars are useful: Most of the chemical elements
on the periodic table are created in stars.
Hydrogen and helium formed very early in the life
of the universe, before stars had formed, but
other elements are actually made in stars and
supernovae when hydrogen and helium nuclei (a
nucleus is the center of an atom) come together to
make nuclei with more protons. Without stars,
there wouldn’t be the silicon, oxygen, iron, and
magnesium that make up most of earth, and there
wouldn’t be the carbon, oxygen, and nitrogen that
make up most of the cells of living things.
There are many other reasons that stars are
useful. Can you think of any?
Click Here to return to the search form.