Observers could see up to seven planets line up in the sky after sunset on Friday, but you may need a telescope to see them all.

The discovery points to what astronomers have thought for decades, that Saturn's rings were caused by a massive collision ...

Five planets are visible to the naked eye, according to NASA: Mercury, Venus, Mars, Jupiter and Saturn. Mars will appear reddish and high in the sky, near the Gemini constellation, Star Walk said.

Seven planets are on display in the night sky at the end of February, but some will be harder to spot than others. Here’s what you need to know to catch a glimpse.