哈佛大學（Harvard University）2位物理理論學家Lisa Randall和Matthew Reece提出新理論，認為：我們銀河系盤面中有個薄薄的暗物質盤（disk of dark matter），太陽系會週期性穿越這個暗物質盤，可能會觸發彗星或隕石體大量撞擊地球，導致包括恐龍在內的某些物種滅絕。不過這個暗物質盤的存在與否，尚須天文觀測進行驗證；所以關於暗物質滅了恐龍的說法，雖然有趣，但仍須審慎以對。
一般認為暗物質與其他物質的重力交互作用並不強，因此很難逐漸沈澱安頓成這樣的盤狀結構。但這些科學家認為有一小部分暗物質的行為舉止和其他暗物質截然不同。他們在去年發展的「分散暗物質理論（dissipative dark matter）」，就是企圖解釋費米伽瑪射線太空望遠鏡（Fermi Gamma-ray Space Telescope）觀測到的來自銀河中心、似乎是暗物質發出的訊號。從Randall等人的理論模型，這個暗物質盤的厚度約僅35光年，密度則為約每平方光年1太陽質量—這樣的密度已足以引起週期性的彗星雨。
不過這個3倍可能性比例的論調，並不是所有科學家都接受的。德國普朗克天文研究所（Max Planck Institute for Astronomy）天文物理學家Coryn Bailer-Jones表示：3:1這樣的比例，大概就是沒特別狀況，不太會提起的那種程度；更何況如果用不同角度去看描述暗物質盤的那些參數，其實完全可以得出別種不一樣的結果。再者這個模型也沒有考慮遠離歐特雲的那些小行星，但這些小行星其實對地球隕坑的形成貢獻也不小，這導致隕坑來自歐特雲受暗物質盤擾動導致彗星大量襲擊的比例是有誤差的。
堪薩斯大學（University of Kansas）天文物理學家Adrian Melott也表示：隨機選取隕坑，但這些隕坑的年齡估計的誤差有些其實頗大，這些也增加了用隕坑統計記錄來預測週期的不確定性；或許分散暗物質盤理論是一種可能的解釋，但並不能清楚且確實的解釋所有事情。
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哈佛大學（Harvard University）2位物理理論學家Lisa Randall和Matthew Reece提出新理論，認為：我們銀河系盤面中有個薄薄的暗物質盤（disk of dark matter），太陽系會週期性穿越這個暗物質盤，可能會觸發彗星或隕石體大量撞擊地球，導致包括恐龍在內的某些物種滅絕。不過這個暗物質盤的存在與否，尚須天文觀測進行驗證；所以關於暗物質滅了恐龍的說法，雖然有趣，但仍須審慎以對。
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