長久以來,天文學家們一直認為,造父變星的狀態是不變的。不過,目前加拿大西安大略大學(the University of Western Ontario)的Pauline Barmby及同僚們提出報告,在該團隊研究的29顆造父變星中,約1/4正在喪失質量。當此些變星喪失質量時,遮蔽它們的塵霧會導致錯誤的距離估測。
文中來自較早相關研究的圖片,顯現了此類變星之一Delta Cephei,使用斯皮策太空望遠鏡(the Spitzer Space Telescope)所獲得的紅外線影像。紅色區域是該變星衝過星際氣體及塵埃時,激烈震動所產生的。震動形式揭露,這是由來自Delta Cephei百萬倍於咱們太陽的恆星風所引起。因此,宇宙距離梯級中不健全的較低梯級是否使得此梯級本身不可靠?
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前庭系統中對聲音最敏感的是球狀囊,它可能在聲音誘發肌肉收縮反應時扮演某種角色。事實上,夜店舞曲的重低頻鼓聲,其頻率分佈就很接近球狀囊最敏感的頻率,因此當人們藉由讓點頭動作跟鼓聲同步,應該可以造成愉悅感。
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男性跑步時聽大聲的音樂會刻意去增加地面傳到腳底的反作用力,可見跑者的邁步方式會受到重低音的音樂所影響,讓腳底觸覺及頭部垂直加速度與重低音整合更佳。
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跟著音樂跑,會讓邁步動作變得自動化,步頻也會更穩定(不會忽快忽慢)