Corona
umbra
The center of a comet is called its nucleus.
The lighter colored region around the dark center of a hotspot is known as the "umbra." It is the innermost and darkest part of a sunspot or the dark central region of a volcanic hotspot.
It's called a nucleolus
No. A sunspot is a slightly cooler area of the surface associated with magnetic disturbances within the Sun. The eruptions of gas are called prominences, and they are related to the phenomenon called solar flares.
umbra
umbra
The lighter-colored region around the dark center of a sunspot is called the penumbra. It consists of less dense magnetic field lines compared to the umbra, which is the darkest part of the sunspot.
Penumbra
Umbra.
Sunspot
The center of a comet is called its nucleus.
An area on the sun that is cooler is called a sunspot.
The darkened area of a sunspot is called the umbra. It is the central region of a sunspot where the magnetic field is strongest, causing the area to appear darker compared to the surrounding photosphere of the Sun.
Sunspot
A small sunspot is called a plage. Plages are regions on the Sun's surface that appear brighter than their surroundings due to intense magnetic activity.
The dense center portion of the nucleus is called the nucleolus. It is responsible for producing ribosomes, which are essential for protein synthesis within the cell. The nucleolus is composed of proteins and RNA.