(英语). Solar Cycle Prediction. NASA Marshall Space Flight Center. [2021-03-03]. (原始内容存档于2021-04-10). Solar Cycle Progression. NOAA Space Weather Prediction
You Say the Sun Has Spots? (页面存档备份,存于互联网档案馆)". Space Today Online. Phillips, A. (2008). "Solar Cycle 24 Begins (页面存档备份,存于互联网档案馆)". Science @ NASA. SIDC
temperature in space because it has no atmosphere. The phase change heat exchanger has two modes of operation. In the first mode, which uses a freeze cycle, heat