A parsec is a standard astronomical measurement that is often misunderstood. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A parsec is a unit ...

The parsec is a unit of astronomical distance. The parsec's definition is rooted in the parallax effect. The parsec is used to measure large-scale astronomical distances. The parallax effect forms the ...

Figure 1: Hardness ratio (HR2) distribution of X-ray point sources with net counts of C ≥ 100 at a projected radial distance from Sgr A*. Before concluding that the HR2 probability distribution in the ...

- a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years ...