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Diameter : 1,384,000 km.
Age:4.5 billion years .
Satellites :9 planets.
A rather ordinary ,middle-age star ,the
gaseous sun may reach a temperature of 27
million degrees celslus at its core . Its 11year cycle is now approaching a solar
maximum ,a period mark ed by frequent
sunspots and flares. On earth ,some radio
waves will be disturbed and the amazing sky
streamers called northern lights will appear.
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Diameter:4,849.6km
Moons: none.
Average distance to the sun;57.6 km
Time to orbit the sun:88 days.
• Diameter: 12,032km.
• Moons: none.
• Average distance to the sun: 107.52
million km.
• Time to orbit the sun: 225 days.
• Diameter:12,739.2 km.
• Moons:1
• Average distance to the sun:148.8
million km.
• Time to orbit the sun:365 days
Diameter : 6,755.2 km .
Moons :2.
Average distance to the sun : 225.6 million km.
Time to orbit the sun :678 days .
The Viking probes fail to find any sing of life .
Beneath its thin atmosphere, mars is barren, covered
with pink soil and boulders.
Long ago it was more active ; the surface is marked
with dormant volcanoes and deep chasms where
water once freely flowed .
• Diameter:141,968 km.
• Moons: 16.
• Average distance to the sun: 772.8
million km.
• Time to orbit the sun: 11.9 years.
• Diameter: 119,296 km.
• Moons: 20 or more.
• Average distance to the sun:
1,417.6 million km.
• Time to orbit the sun: 29.5 years.
• Diameter: 49.000 km.
• Moons: 8.
• Average distance to the sun: 4,497
million km.
• Time to orbit the sun: 165 years.
• Diameter: 3,040 km.
• Moons: 1.
• Average distance to the sun: 5,865.6
million km.
• Time to orbit the sun: 248 years.