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freedom today, tomorrow, and for as long as it takes! >> reporter: the speech in lithuania's capital, coming at the end oh of a dramatic, sometimes heated two days of discussions over ukraine's future within the nato alliance. >> it's going to happen. we're moving in the right direction. i think it's just a matter of getting by the next few months here. >> reporter: presidents biden and volodymyr zelenskyy all raise and thanks closing out the nato summit, despite ukraine coming away without the biggest ticket item it had hoped for -- a concrete path to nato membership. zelenskyy came...

We've been able to look back in time over 13.5 billion years to sea see some of the very first galaxies that were born after the big bang. we've seen these really incredible clouds on titan. we've been able to look in detail at the atmospheres of exo planets, planets orbiting other stars outside of our solar system, and we're all long learning more about our universe in scales all the way from our sort of cosmic backyard to the solar system, all the way out most distant reaches of space. >> dr. amber straun, thank you so much for your expertise and your time today. really appreciate it. comi...

For most of human history, there have been varying assumptions about the age of the Earth and the rest of the planets. How old is the solar system, and how was it determined?