| Big time for crosswords? | 24 |
| Astronomical time span | 22 |
| Annoying wait, facetiously | 26 |
| A frickin' long time | 24 |
| A billion years, to Hubble | 26 |
| Vast stretches of time | 22 |
| Geological time periods | 23 |
| Incalculable amount of time | 27 |
| Extremely long time frames | 26 |
| Geologic time divisions | 23 |
| Centuries of centuries | 22 |
| Ages upon ages of time | 22 |
| Units of geologic time | 22 |
| Thousands of centuries | 22 |
| They seem to last forever | 25 |
| Extremely long stretches | 24 |
| Evolutionary time periods | 25 |
| Billion-year increments | 23 |
| An eternity, seemingly | 22 |
| A long, long, long time | 23 |
| A kazillion years, it seems | 27 |
| A billion years, geologically | 29 |
| Very long periods of time | 25 |
| Unimaginably long stretches | 27 |
| Unfathomable stretches | 22 |
| Some collars and jackets | 24 |
| Near-infinite timespans | 23 |
| Mind-boggling time spans | 24 |
| Long periods, geologically | 26 |
| Long geologic stretches | 23 |
| Indefinite time periods | 23 |
| Inconceivably long times | 24 |
| Incalculable amounts of time | 28 |
| I-don't-know-how-long | 25 |
| Geological time divisions | 25 |
| Extremely long time periods | 27 |
| Earth's age, perhaps | 24 |
| Astronomical time periods | 25 |
| Archean and Proterozoic | 23 |
| An extremely long time | 22 |
| Ages that boggle the mind | 25 |
| Aurora's counterpart | 24 |
| Hyperion's daughter | 23 |
| Greek goddess of the dawn | 25 |
| Goddess of the morning | 22 |
| Sister of Helios and Selene | 27 |
| Volkswagen convertible | 22 |
| Mythical goddess of the dawn | 28 |
| Daughter of the Titans | 22 |
| Volkswagen coupe convertible | 28 |
| Thea's daughter, in myth | 28 |
| She's a morning person | 26 |
| She was also called Aurora | 26 |
| Rosy-fingered dawn goddess | 26 |
| Possible concert camera | 23 |
| Orion made love to her | 22 |
| Memnon's mother, in Homer | 29 |
| Lover of Tithonus, in myth | 26 |
| Lover of Orion, in Greek myth | 29 |
| Greek counterpart of Aurora | 27 |
| Goddess of early risers | 23 |
| Gate opener for Apollo | 22 |
| Canon autofocus film system | 27 |
| Camera named for a goddess | 26 |
| AuroraÂ’s Greek equivalent | 29 |
| Aurora's Greek equivalent | 29 |
| Aurora, to an Athenian | 22 |
| Aristotle's Aurora | 22 |
| Acronymic Canon camera | 22 |
| A daughter of Hyperion | 22 |
| Red dye used in cosmetics | 25 |
| Red dye used in a biology lab | 29 |
| Red fluorescent dye: Var. | 25 |
| Emission-regulating org. | 24 |
| Govt. clean air watchdog | 24 |
| Fed. air quality monitor | 24 |
| Agcy. that polices polluters | 28 |
| Org. established by Nixon | 25 |
| Emissions detecting agcy. | 25 |
| Air quality overseer (Abbr.) | 28 |
| Pollution-policing org. | 23 |
| Pollution-fighting org. | 23 |
| Pollution control org. | 22 |
| Org. with an Office of Water | 28 |
| Energy Star program org. | 24 |
| Superfund enforcer: Abbr. | 25 |
| Govt. emissions watchdog | 24 |
| Agcy. involved with cleanup | 27 |
| WasteWise watchdog (abbr.) | 26 |
| Waste watchers (abbr.) | 22 |
| U.S. emissions controller | 25 |
| Toxic-level monitor, briefly | 28 |
| Standards issuer, briefly | 25 |
| Smog watchdogs (Abbr.) | 22 |
| Pollution watchdog: Abbr. | 25 |
| Pollution stds. setter | 22 |
| Pollution monitoring org. | 25 |
| Pesticide-regulating org. | 25 |
| Org. concerned with PCB's | 29 |
| Org. concerned with CFCs | 24 |