Latest David Elbaz Stories
ESA's Herschel infrared space observatory has discovered that galaxies do not need to collide with each other to drive vigorous star birth.
Which comes first, the supermassive black holes that frantically devour matter or the enormous galaxies where they reside?
- A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.