The spectrum of light from a star does have gaps, known as absorption lines. These gaps are caused by atoms in the star's atmosphere absorbing specific wavelengths of light.

Here's a breakdown:

* Continuous Spectrum: A star's surface emits a continuous spectrum of light, meaning it emits light at all wavelengths.

* Absorption Lines: As this light passes through the star's atmosphere, certain atoms absorb specific wavelengths of light. This absorption is specific to the element and its energy levels.

* Spectral Fingerprint: The resulting spectrum is no longer continuous but has dark lines where light has been absorbed. These absorption lines act like a spectral fingerprint, allowing astronomers to identify the elements present in the star's atmosphere.

Example:

* Hydrogen atoms absorb light at a specific wavelength, resulting in a dark line in the star's spectrum.

Significance:

* Composition: By analyzing the absorption lines, astronomers can determine the composition of stars.

* Temperature: The strength and position of the absorption lines are also related to the star's temperature.

* Movement: The Doppler shift of the absorption lines tells us whether a star is moving towards or away from us.

Therefore, while the spectrum of light from a star appears continuous at first glance, closer examination reveals gaps (absorption lines) that provide crucial information about the star's properties.