| 100% | SPACEAGE | 8 | Period that started with Sputnik |
| 65% | SPACEAGE | 8 | Time period that began with Sputnik in 1957 |
| 60% | ROMANA | 6 | Pax ___ (period that started with the reign of Augustus) |
| 57% | BIDEN | 5 | With 10-Across, period that started in January 2021 |
| 56% | SPACEAGE | 8 | Technologically advanced period that began with the launch of Sputnik: 2 wds. |
| 54% | APR | 3 | Mo. that starts with pranks |
| 53% | POOL | 4 | Game that starts with a break |
| 53% | EEL | 3 | Fish that starts with two vowels |
| 53% | URL | 3 | Address that starts with "www": Abbr. |
| 53% | OMAN | 4 | Only country that starts with O |
| 53% | OMAN | 4 | Only country that starts with "O" |
| 52% | SPACEAGE | 8 | Era that began with Sputnik |
| 52% | XENON | 5 | Only chemical element that starts with X |
| 52% | LLAMA | 5 | Animal that starts with a double letter |
| 52% | SUBREDDIT | 9 | Online community section that starts with /r/ |
| 52% | HASHTAG | 7 | Twitter topic that starts with a # symbol |
| 52% | BLACKBIRD | 9 | Beatles song that starts with a color |
| 52% | XENON | 5 | Only element that starts with an "X" |
| 52% | URL | 3 | Website address that starts with "www": Abbr. |
| 52% | APR | 3 | Month that starts with pranks, for short |
| 52% | ONE | 3 | Number of countries that start with "Y" |
| 52% | PROPER | 6 | Like nouns that start with capital letters |
| 51% | LENT | 4 | 40-day period that starts on Ash Wednesday |
| 51% | ALPHABET | 8 | Preschool recitation that starts with "A, B, C ..." |
| 51% | APR | 3 | First month that starts with a vowel: Abbr. |
| 51% | ARMWRESTLING | 12 | Contest that starts with elbows on a table |
| 51% | GNOME | 5 | Lawn ornament that starts with a silent letter |
| 51% | ANA | 3 | Californian city and river that starts with Santa |
| 51% | ATOMICAGE | 9 | Period that began with a bang? |
| 51% | OTS | 3 | Periods that may end with FGs |