×
Log in
Upload File
Most Popular
Study
Business
Design
Technology
Travel
Explore all categories
The top documents tagged [sunspot areas]
The Sun. How Old Is Our Sun? Stars like the Sun shine for nine to ten billion years The Sun is about 4.5 billion years old, judging by the age of moon
217 views
1 Reconciling Group and International Sunspot Numbers Leif Svalgaard, HEPL, Stanford University Edward W. Cliver, Space Vehicles Directorate, AFRL XII
224 views
Prediction on Time-Scales of Years to Decades
27 views
Reconciling Group and International Sunspot Numbers
44 views
What is Solar Energy?
28 views