You Are All Stardust.

Now, Almost One Hundred Years Later, It Is Difficult To Fully Appreciate How Much Our Picture Of The Universe Has Changed In The Span Of A Single Human Lifetime. As Far As The Scientific Community In 1917 Was Concerned, The Universe Was Static And Eternal, And Consisted Of A One Single Galaxy, Our Milky Way, Surrounded By Vast, Infinite, Dark, And Empty Space. This Is, After All, What You Would Guess By Looking Up At The Night Sky With Your Eyes, Or With A Small Telescope, And At The Time There Was Little Reason To Suspect Otherwise.

If Our Species Is To Survive, Our Future Will Probably Require Outposts Beyond Our Own Planet.

Philosophy Used To Be A Field That Had Content, But Then Natural Philosophy Became Physics, And Physics Has Only Continued To Make Inroads. Every Time Theres A Leap In Physics, It Encroaches On These Areas That Philosophers Have Carefully Sequestered Away To Themselves, And So Then You Have This Natural Resentment On The Part Of Philosophers.

Empty Space Is A Boiling, Bubbling Brew Of Virtual Particles That Pop In And Out Of Existence In A Time Scale So Short That You Can't Even Measure Them.

It Really Is The Most Poetic Thing I Know About Physics: You Are All Stardust.