... One of the most active sunspot groups in years is currently crossing the Sun. AR 1302 first came around the Sun's edge last week and is so large it can be seen without a telescope. Flying over Planet Earth . ... Around the South Pole of Mars, toward the end of every Martian summer, the warm weather causes a section of the vast carbon-dioxide ice cap to evaporate. ... The South Pole of Asteroid Vesta . ... What created the circular structure around the south pole of asteroid Vesta? ...