Question

apparent magnitude
scientists measure how bright stars look from earth using a scale created by the ancient greek astronomer hipparchus (hi par kus). hipparchus assigned a number to every star he saw in the night sky. the number was based on the stars brightness. astronomers today call these numbers magnitudes. the apparent magnitude of an object is a measure of how bright it appears from earth.
some objects have negative apparent magnitudes. this is shown in the figure below. that is because hipparchus assigned a value of 1 to all the brightest stars. he assigned higher numbers to the less bright stars. he did not assign values to the sun, the moon, or venus. astronomers later assigned negative numbers to the sun, the moon, venus, and a few bright stars.
enter your answer.
explain examine the image. how do scientists measure the brightness of a star?
check your answer.

Explanation:

The text clearly states that scientists measure the brightness of a star using the apparent magnitude scale. This scale, created by Hipparchus and refined over time, assigns numbers to stars based on their brightness as seen from Earth. Negative magnitudes indicate brighter objects, with lower (more negative) numbers corresponding to greater brightness. The scale is visualised in the provided image, showing different celestial objects and their respective magnitude values.

Answer:

Scientists measure the brightness of a star using the apparent magnitude scale. This scale assigns numbers to stars based on their brightness as seen from Earth, with negative magnitudes for brighter objects.