(NEIL DEGRASSE) TYSON, WELCOME TO THE UNIVERSE — I have an app on my computer, such that every time I bring up the desktop, the Moon is there, showing its phase, day by day. That’s my lunar clock. It connects me to the universe even when I’m staring at my computer screen.
| A. | Actor who played Jim Lovell in "Apollo 13" (2 wds.) | TOMHANKS |
| B. | Observatory long operated by the University of Chicago | YERKES |
| C. | Quotidian disappearing act | SUNSET |
| D. | Exemplar of positivity | OPTIMIST |
| E. | Popular PBS series since 1974 | NOVA |
| F. | Circe and Medea, for two | WITCHES |
| G. | Gas released during fracking | ETHANE |
| H. | Stylus for digital drawing (2 wds.) | LIGHTPEN |
| I. | Son of Venus and Mars | CUPID |
| J. | Sector spanning 45 degrees | OCTANT |
| K. | "Bones" aboard the Enterprise | MCCOY |
| L. | "Eureka" moment | EPIPHANY |
| M. | Gadget guru | TECHIE |
| N. | Rare metal twice as dense as lead | OSMIUM |
| O. | Varied the thrust of, as an engine | THROTTLED |
| P. | Planetarium featuring a "Big Bang Theater" | HAYDEN |
| Q. | Pioneer in the study of shock waves (2 wds.) | ERNSTMACH |
| R. | Vantage point for viewing a total eclipse | UMBRA |
| S. | Ice giant orbited by Triton | NEPTUNE |
| T. | Nonhuman 2011 "Jeopardy!" champ (2 wds.) | IBMWATSON |
| U. | Interstellar probe carrying a record including Chuck Berry's "Johnny B. Goode" | VOYAGER |
| V. | Book of celestial tables | EPHEMERIS |
| W. | Post-splashdown activity | RECOVERY |
| X. | Skylab's launch vehicle (2 wds.) | SATURNV |
| Y. | Mercury's atomic number | EIGHTY |