Now Playing: Future of space on Apollo 11 anniversary

Now Playing: Neil Armstrong's spacesuit goes on display for 1st time in more than a decade

Now Playing: Manhunt underway after shooting of recent college graduate

Now Playing: Fatal police shooting under investigation in Texas

Now Playing: Biden braces to take on COVID-19 emergency

Now Playing: Officer recounts 'medieval battle' against Capitol mob

Now Playing: Biden picks Alondra Nelson as deputy science policy chief

Now Playing: Biden adds science adviser to Cabinet

Now Playing: Biden reveals key members of science team

Now Playing: Zoo welcomes birth of Francois’ leaf monkey

Now Playing: Winter storm brought heavy snow to parts of Midwest

Now Playing: Texas man killed by police after mental distress call

Now Playing: NRA files for bankruptcy

Now Playing: Who are the people who stormed the capitol?

Now Playing: Mega Millions and Powerball jackpots combine for $1.39 billion

Now Playing: CDC warns UK variant could become predominant COVID variant in US by March

Now Playing: COVID-19 vaccine access proves difficult in multiple states

Now Playing: Members of Congress concerned for safety

Now Playing: Washington readies for inauguration as security concerns remain high

Now Playing: Inauguration security ramps up, over 300 people face charges in Capitol riot: Part 2