Graphing variables is a critical skill in science. If something depends on something else – like the speed of sounds depends on air density, or the surface gravity of an object depends on its size – ...

A simple diagram, which celebrates its centennial this year, continues to serve as the most essential conceptual tool in stellar astrophysics Modern astronomy paints a vivid picture of the universe ...

Stars come in different types, and most stars will change types throughout their lifetimes. Stars are often organized using what's known as the Hertzsprung-Russell (H-R) diagram. Stars like Earth’s ...

This review deals with the H-R diagrams of dM, sdK, and sdM proper-motion stars. It depends heavily on the rapid growth in precision of small parallaxes, combining them with various photometry to ...

IT has been suggested several times 1 that the flare activity observed in flash and U V Ceti stars is of a nature similar to that of solar flares. In this communication I shall adhere to this point of ...

We all wish that we could sometimes see into the future. Now, thanks to the very latest data from ESA’s star mapping Gaia mission, astronomers can do just that for the Sun. By accurately identifying ...

As stars age, a variety of observational characteristics naturally change. Some are dramatically obvious, while others are subtle. The calculated age’s accuracy depends on the star’s mass, its state ...