Parallax

What is the most reliable method for deriving distances to other stars?

• Parallax method

• Redshift measurement

• Spectroscopic analysis

• Luminosity comparison

What is the equation for the distance to a star in parsecs?

• distance (parsecs) = 1 / parallax (arcseconds)

• distance (parsecs) = parallax (lightyears)

• distance (parsecs) = 2 * parallax (arcseconds)

• distance (parsecs) = parallax (arcseconds)

what is the difference between parallax motion and proper motion?

• Parallax motion is the actual movement of a star, while proper motion is an apparent shift due to viewing angle.

• Parallax motion is an apparent shift due to viewing angle, while proper motion is the actual movement of a star across the sky.

• Proper motion is the change in brightness of a star, while parallax motion is its distance from Earth.

• Parallax motion refers to the speed of a star, while proper motion refers to its color.

The distance to a star is​ (a)   proportional to the parallax angle.

• Inversely

• directly

The apparent shift of position of any nearby star against the background of distant objects.

• parallax

• variable stars

• ecliptic

• cepheids

A star is at a distance of 5 parsecs. What is its parallax in arcseconds?

Mathematical Equivalence

ON

Parallax is used to determine a star’s

• distance from Earth.

• brightness.

What is the definition of parallax that they are talking about?

• The phenomenon of objects appearing larger when viewed from a closer distance.

• The apparent shift in the position of an object when viewed from different angles.

Avery, Laveah, and Ky are stargazing and discussing how astronomers measure the distance to stars. They come up with different ideas. Which method correctly describes the use of parallax to measure the distance to stars?

• They all agree on using a telescope to directly measure the distance

• Ky believes it's by observing the apparent shift in the position of a star when viewed from different points in Earth's orbit around the Sun

Marqueeze, Jalen and Alyssa are stargazing and discussing parallax. They wonder why parallax is only useful for measuring distances within a certain range. Can you help them understand?

• Parallax is not accurate for measuring long distances.

• The amount of parallax observed decreases as the distance to the object increases.