The comet will make its closest approach to Earth Tuesday, but Monday may be the best evening to see it. Come Monday around sunset, Teddy Kareta plans to ascend to the roof of a building near ...

Mars will shine close to the blue star Spica at sunset on Sept. 13, but you'll need a clear view of the western horizon to catch the colorful duo before they slip swiftly out of view. Look west as the ...

The crescent moon shines close to Mars above the western horizon at sunset on Sept. 24, but you'll need to be quick to spot the red planet before it slips swiftly from view alongside the twinkling ...