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THE SUN
By Owain Partington
CONTENTS
 Definition
 Interesting Facts
 Physical Properties and Statistics
 The Yohkoh Solar Observatory Satellite
 The SOHO Satellite
 Pictures

DEFINITION
The Sun is our main source of light and Heat.
It is a giant ball of burning gas. It projects
ultra violet rays but our ozone layer protects
us from its radiation. It is a source of Vitamin
D and we need the Sun to Survive.
INTERESTING FACTS
 The Sun is 93,000,000 miles from Earth
 It only takes 8.5 minutes for its light to reach Earth
 The Sun is 9.7 times bigger than Jupiter
 1,300,000 Earths would fit into the Sun
 The Sun is a Yellow Star
 There are thousands of colder patches on the Sun, they are called ‘Sunspots’
PHYSICAL PROPERTIES AND STATISTICS
 The Core Temperature is 22,000,000 degrees
 The Surface temperature of the Sun is about 10,000 degrees
 The Corona Temperature is about 2,000,000 degrees
 There are thousands of Sunspots scattered over the Sun
 The Sun is about 1,392,000 km in diameter
 It spins 360 degrees every 25 days
 The Sun moves around the centre of the Galaxy once every 200,000,000 years
THE YOHKOH SOLAR OBSERVATORY SATELLITE
Have you ever wondered where pictures of the Sun came from? They came from the Yohkoh
Solar Observatory Satellite.
 The Satellite was launched August 31, 1991, from Japan.
 The Satellite takes X-rays of the Sun and send them back in images we cant normally
see.
 The word ‘Yohkoh’ means ‘Sunbeam’
 It also sent back gamma ray emissions (pictures like an X-ray)
 It has spectral lines that provided information about the temperature and density of the
Plasma in Solar Flares.
THE SOHO SATELLITE
 SOHO means ‘Solar and Heliospheric Observatory’
 It was launched on December 2 1995, to study the Sun.
 It has also discovered about 2700 Comets
 Around this time last year the mission was extended to December 2016.
 It was originally only a 2 year mission
 The main purpose was to study the Sun and to crack the theory of space weather.
PICTURES
Thank You For Listening
www.hesperia.gsfc.nasa.gov/sftheory/yohkoh.htm
www.en.wikipedia.org/wiki/solar_and_heliospheric_observatory
The Science Powerpoint
My Proir Knowledge