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Explanation: How were these unusual Martian spherules created? Thousands of unusual gray spherules made of iron and rock and dubbed blueberries were found embedded in and surrounding rocks near the landing site of the robot Opportunity rover on Mars in 2004. To help investigate their origin, Opportunity found a surface dubbed the Berry Bowl with an indentation that was rich in the Martian orbs. The Berry Bowl is pictured here, imaged during rover's 48th Martian day. The average size of a Martian blueberry rock is only about 4 millimeters across. By analyzing a circular patch in the rock surface to the left of the densest patch of spherules, Opportunity obtained data showing that the underlying rock has a much different composition than the hematite rich blueberries. This information contributes to the growing consensus that these small, strange, gray orbs were slowly deposited from a bath of dirty water.
APOD Turns 30!:
Free Public Lecture in Cork, Ireland on Tuesday, June 24 at 7 pm
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: Mars
Publications with words: Mars
See also:
- APOD: 2025 September 28 Á Leopard Spots on Martian Rocks
- APOD: 2025 July 15 Á Collapse in Hebes Chasma on Mars
- APOD: 2025 July 6 Á The Spiral North Pole of Mars
- APOD: 2025 June 29 Á Dark Sand Cascades on Mars
- APOD: 2025 June 15 Á Two Worlds One Sun
- Perseverance Selfie with Ingenuity
- Deimos Before Sunrise