We can never truly repay the debt we owe our fallen heroes. But we can remember them, honor their sacrifice, and affirm in our own lives those enduring ideals of justice, equality, and opportunity for which generations of Americans have given that last full measure of devotion.

“Low plastic stool, cheap but delicious noodles, cold Hanoi beer.” This is how I’ll remember Tony. He taught us about food — but more importantly, about its ability to bring us together. To make us a little less afraid of the unknown. We’ll miss him.

This is the start of a movement. Thank you all.

Mr President - Greenland is not for sale. But Denmark has a much better deal for you! Watch this. #dkgreen #dkpol

Gigantic, colliding, black holes. Or, things that got bump in the night. My friend and colleague Phil Plait, a.k.a. @TheBadAstronomer writes about it here. syfy.com/syfywire/the-b…

Proud of you Dr. J, Always. Congratulations my friend. 🙏🏾❤️🚀👩🏽‍🚀

I can confirm – NASA JPL is a great place. I have a new home now, but I’ll always remember my California roots.

Miss my landing? Catch the highlights below. Send us your own highlights too. Share your pictures and video using #CountdownToMars.

As we ALL come together around a common purpose and truth, we can train our brains to not only… instagram.com/p/BVDME_0hP_j/

The Earth is mostly water. Numerous students from local schools have never been in or on the… instagram.com/p/BVQsaXPBfth/

Juice = sugar. Sugar = poison. / So that there is no scientific confusion. 🔬 🌎 / Your brain… instagram.com/p/BVVLSQJhIH3/

Request for ideas…

Of all that I've done in my life, I'm most proud to be Sasha and Malia's dad. To all those lucky enough to be a dad, Happy Father's Day! x.com/michelleobama/…

The day with most Sunlight: Happy Summer Solstice to all Earthlings north of the equator. Now thru Dec 21 daytime get shorter

Falcon 9 and 10 Iridium NEXT satellites are vertical on SLC-4E at Vandenberg Air Force Base in California.

Total Solar Eclipses occur somewhere on Earth every two years, or so. So just calm yourself when people tell you they're rare

Key to our happiness: no politics, Donald J. Trump or congress -- just #Eclipse2017 and science! Love u Earthlings

WOW x.com/neiltyson/stat…

His passing has left an intellectual vacuum in his wake. But it's not empty. Think of it as a kind of vacuum energy permeating the fabric of spacetime that defies measure. Stephen Hawking, RIP 1942-2018.