Phát hiện ba xác thiên hà
Nhờ kính thiên văn vũ trụ Spitzer, các nhà thiên văn vừa phát hiện ba thiên hà ''chết'', ngừng hình thành sao cách đây rất lâu. Theo họ, lỗ đen khổng lồ bên trong đã làm cho các thiên hà này thiếu vật chất để tạo sao mới.
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