For decades, scientists believed that long, dark streaks on the surface of Mars were a sign of something crucial: running ...

A set of dark streaks that regularly wind across the Martian surface are more likely to be formed by dust and wind than by ...

Strange, dark streaks on Martian slopes that once hinted at flowing water are now believed to be dry dust slides, revealed ...

Mysterious streaks of light were seen in the sky in the Sacramento area Friday night, shocking St. Patrick’s Day revelers who then posted videos on social media of the surprising sight.

Mysterious streaks of light were seen in the sky in the Sacramento area Friday night, shocking St. Patrick’s Day revelers who then posted videos on social media of the surprising sight.

Mysterious streaks of light were seen in the sky in the Sacramento area Friday night, shocking St. Patrick's Day revelers who then posted videos on social media of the surprising sight.

When viewed in ultraviolet light, Venus' clouds exhibit dark streaks where something is absorbing those high-energy wavelengths. Over the decades, all manner of explanations for the absorbing ...

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Mysterious streaks of light were seen in the sky in the Sacramento area Friday night, shocking St. Patrick’s Day revelers who then posted videos on social media of the surprising sight.