The Sun
The Sun is a yellow dwarf star (G2V), about 4.6 billion years old, and the dominant gravitational force in the Solar System. It has a diameter of roughly 1.4 million kilometers and contains around 99.8% of the Solar System’s mass. Nuclear fusion in its core converts hydrogen into helium, producing energy that warms the planets. Above the core lie the radiative and convective zones, followed by the visible photosphere (~5,500 °C), the chromosphere, and the much hotter corona (~2 million °C).
Source: science.nasa.gov
APODs including "The Sun"
Hale-Bopp Above the Cinqui Torri Mountains
10/06/1997
M101: An Ultraviolet View Credit:
08/06/1997
Small Star Credit:
05/06/1997
Southern Neptune
29/05/1997
Mars: Just The Fiction
28/05/1997
Old Faithful Meets Hale-Bopp
26/05/1997
Hale-Bopp's Fickle Ion Tail
14/05/1997
M42: A Mosaic of Orion's Great Nebula
11/05/1997
Ultraviolet Venus Credit:
07/05/1997
Big Sky Comet Credit and Copyright:
21/04/1997
Pwyll: Icy Crater of Europa Credit:
17/04/1997
A Star Cluster Through Hale-Bopp's Tail Credit and Copyright:
16/04/1997
Hale-Bopp and Plateau de Bure Interferometer Credit and Copyright:
15/04/1997
Hale-Bopp's Hoods Credit:
14/04/1997
The Sun Puffs Credit:
11/04/1997
Comet Hale-Bopp Over New York City Credit and Copyright:
08/04/1997
A Comet In The Sky Credit:
28/03/1997
The Weather on Mars Credit:
24/03/1997
Comet Hale-Bopp's Developing Tails Credit:
14/03/1997
Hale-Bopp Brighest Comet This Decade Credit:
13/03/1997
COBE Dipole: Speeding Through the Universe Credit:
08/03/1997
Solar Wind And Milky Way Credit:
04/03/1997
Pioneer 10: The First 6 Billion Miles Illustration Credit:
03/03/1997
Sungrazer Credit:
26/02/1997
A Big Cliff on Jupiter's Callisto Credit:
18/02/1997
A Wind From The Sun Credit:
17/02/1997
Betelgeuse, Betelgeuse, Betelgeuse Credit:
16/02/1997
More Jets From Comet Hale-Bopp Credit:
13/02/1997
Comet Hale-Bopp Develops a Tail
12/02/1997
The Gamma Ray Moon Credit:
10/02/1997