| Answer | Crossword Clue |
|---|---|
| ANODE | ... dark space (region in a vacuum tube) |
| halo | region of space surrounding a galaxy that is sparsely populated with luminous objects (as globular clusters) but is believed to contain a great deal of dark matter |
| haloes | region of space surrounding a galaxy that is sparsely populated with luminous objects (as globular clusters) but is believed to contain a great deal of dark matter |
