Welcome, guest. You are not logged in.
Log in or join for free!
Forgot login details?

For free!
Get started!

Text page

px pia

»Protoplanetary Nebulae

The Red Rectangle Nebula, an example of a protoplanetary nebula.

A "protoplanetary nebula" (PPN) is an astronomical object which is at the short-lived episode during a star's rapid stellar evolution between the late asymptotic giant branch (LAGB) phase and the subsequent planetary nebula (PN) phase.

A PPN emits strong infrared radiation, and is a kind of reflection nebula.

The exact point when a PPN becomes a planetary nebula (PN) is defined by the temperature of the central star.

This page:

Help/FAQ | Terms | Imprint
Home People Pictures Videos Sites Blogs Chat