On Monday December 21, Jupiter and Saturn will be so close that they will appear to form a "double planet." A spectacular great conjunction, as the planetary alignment has come to be known, hasn't occurred in nearly 800 years! The 2020 conjunction is especially rare because the planets haven't been observable this close together at night since m...
On Monday December 21, Jupiter and Saturn will be so close that they will appear to form a "double planet." A spectacular great conjunction, as the...