-
Now Playing: NASA Tests Flying Saucer
-
Now Playing: NASA Predicts Spectacular Meteor Shower
-
Now Playing: NASA Astronaut Flips Over 'Gravity' Oscar Wins
-
Now Playing: The Breakdown: Countdown to Inauguration Day
-
Now Playing: Every social media site that restricted Trump or banned from app stores since Jan. 6
-
Now Playing: COVID-19 vaccine rollout delayed
-
Now Playing: California faces COVID-19 crisis
-
Now Playing: Your Voice: ICU nurses
-
Now Playing: Over 25,000 National Guardsmen deployed to DC in wake of Capitol riot
-
Now Playing: President-elect Biden unveils $1.9 trillion stimulus plan
-
Now Playing: FBI warns of possible ‘explosive’ events across the country
-
Now Playing: Latest on COVID-19 vaccine distribution
-
Now Playing: How Joe Biden's inauguration will be different from previous years
-
Now Playing: James Comey on if Trump should be pardoned
-
Now Playing: Capitol rioter requests Trump pardon
-
Now Playing: James Comey calls threat of riots on Inauguration Day ‘very concerning’
-
Now Playing: Overcoming discrimination: openly gay sheriff is pioneer in fight against homophobia
-
Now Playing: ABC News Live Update: President-elect Biden's $1.9 trillion plan to fight COVID-19
-
Now Playing: Ilhan Omar talks Trump impeachment, threats against Congress
-
Now Playing: ABC News Live Update: FBI issues new stern warning as riot investigation continues