Measuring Distances in Astronomy

What is the fundamental technique used by astronomers to measure distances in space?

• Spectroscopy

• Redshift

• Parallax

• Photometry

What is the formula used to calculate the distance to a star using parallax?

• d = p/1

• d = 1/p

• d = p * 1

• d = 1 * p

What is the main challenge in measuring parallax angles smaller than 0.01 arcseconds from Earth?

• Atmospheric magnetic field

• Lack of technology

• Distance of stars

• Earth's atmosphere

What does a redshift in light from an object indicate?

• The object is moving parallel the observer

• The object is moving towards the observer

• The object is stationary

• The object is moving away from us

What is the redshift parameter 'z' used to measure?

• Magnitude

• Temperature of stars

• Brightness of stars

• Motion and distance of cosmic objects