Sara LeMar

#LunarEclipse FAQ:

Q: Is it safe to look at?
A: Absolutely! Unlike a solar eclipse, there's no UNsafe time to look at a lunar eclipse.

Q: Do I need a telescope?
A: Nope! Best view is with naked eye. Just look up!

Q: Does the eclipse portend terror & doom?
A: Not at all! The news has that covered.

Why haven’t humans been back to the moon in over 50 years? | CNN Humans haven’t been back to the lunar surface since the Apollo moon program ended over five decade ago. The reasons why go beyond science, according to experts.

'Cause it's haunted

www.cnn.com/2026/02/13/s...

🚀 LIFTOFF! ESA astronaut Sophie Adenot and #Crew12 are on their way. GO #εpsilon!

You can't... repeal... a scientific finding. At that point it's just called lying about it.

YouTube video by Bruce Springsteen Bruce Springsteen - Streets Of Minneapolis (Official Audio)

I wrote this song on Saturday, recorded it yesterday and released it to you today in response to the state terror being visited on the city of Minneapolis. It’s dedicated to the people of Minneapolis, our innocent immigrant neighbors and in memory of Alex Pretti and Renee Good.

Stay free

Neil deGrasse Tyson presenting at the American Museum of Natural History

"Year in Review" with @neildegrassetyson.com never disappoints. I was glad to share the experience with friends, family, and this year - students. Shared space for scientific thought to inspire motivation is important, now more than ever. @amnh.org

Flying Pig with bulging biceps saying "You can count on me!'

What a find! I'm not so shocked this exists but reminded how deeply appreciative I am of the humor in the physics community.

It's the most wonderful time of the year 🐖 #Iteachphysics #physics 🧪🎢 🍎

🧵
Under a dark sky, the Milky Way looks like a bright band interrupted by black rivers.

Those rivers are not empty space; they are curtains of tiny dust grains that swallow nearly all the starlight trying to reach us.

➡️ apod.nasa.gov/apod/ap25111...

🔭 🧪 #galactic #science #MilkyWay

1/6

Color photo of an oscilloscope running Higinbotham's "Tennis for Two" game. A horizontal line represents the ground, a short vertical line is the net, and a small green dot with a glowing trail is the ball. Image: Brookhaven National Lab

Physicist William Higinbotham was born #OTD in 1910. During the Manhattan Project he was the Electronics Group leader at Los Alamos.

In 1958, while working at Brookhaven Lab, he invented one of the first video games: “Tennis for Two.” It ran on an oscilloscope! 🧪 ⚛️

Image: Brookhaven National Lab

When dividing by a fraction, a lot of people think about the measurement model, but we can think about the partitive model too! Here's why I think the partitive model is powerful.

YouTube video by The Tom Lehrer Wisdom Channel Tom Lehrer - The Elements - LIVE FILM From Copenhagen in 1967

We're saddened to hear that the musical satirist Tom Lehrer passed away this weekend. His original and witty songs were loved by audiences worldwide, but to chemists he'll always be remembered for this classic: www.youtube.com/watch?v=AcS3...

Apollo 11.
Rarely seen shot of Eagle, the Moon and Earthrise, taken on this day, July 21, 1969.
Mike Collin's alternate photo is extremely well known, but this one - shown remastered and cropped - is an absolute beauty!

Happy 82nd birthday to Dame Jocelyn Bell Burnell, born #OTD in 1943. 🧪 🔭 👩‍🔬 🎂

Free, unsolicited advice for physics students: many things will go more smoothly for you if you can derive and explain the simple harmonic oscillator in your sleep

My linocut portrait of Emmy Noether in front of a blackboard with diagrams and equations. Noether is printed in blue. She has her hair up and wears a pin-striped buttoned shirt with puffy sleeves, bow tie, tweed skirt with belt and is shown from waist up, turned slightly away from the viewer. The blackboard is green and shows a simple form of Noether’s equations at the top. On the left are three diagrams to represent translational symmetry (a frame of reference or 3 orthogonal axes and a straight diagonal arrow to a second frame of reference); rotational symmetry (a frame of reference and curved arrow to a second rotated frame of reference); and time symmetry (two simple clocks with an arrow between them and their hands at different places). On the right are the three associated conserved quantities: momentum (a p with arrow above it); angular momentum (an L with arrow above it); and energy (E).

Happy birthday to one of greatest #mathematicians of all time Emmy Noether (1882-1935), here with her eponymous theorem, the backbone of modern physics. 🧪🐡👩🏼‍🔬🧮🎢 #histsci Noether’s theorem links any symmetry of a system with a conservation law. In my portrait, I chose to depict a young Emmy in front 🧵

Registration for the 2025 AAPT High School Physics Photo Contest is now open! This is a great opportunity for students at all levels to combine what they have learned in #physics with their artistic side. ow.ly/nBUE50V9nH6 #PhysicsEducation #AAPTPhotoContest2025

My linocut portrait of astronaut Mae Jemison in her flight suit, holding her helmet, with the globe of Earth above and to left.

An extraordinary American astronaut and science communicator for #BlackHistoryMonth: Mae Carol Jemison (born 1956) is a physician who became the first Black woman to travel in space when she went into orbit aboard the Space Shuttle Endeavour for NASA, on September 12, 1992. 🧪🐡👩🏾‍🔬 #histsci 🧵

How Noether’s Theorem Revolutionized Physics | Quanta Magazine Emmy Noether showed that fundamental physical laws are just a consequence of simple symmetries. A century later, her insights continue to shape physics.

Emmy Noether showed that fundamental physical laws are really just a consequence of simple symmetries. A century later, her insights continue to shape physics. @shalmawegs.bsky.social reports: www.quantamagazine.org/how-noethers...

YouTube video by Mythbusters for the Impatient Vector Vengeance - Mythbusters for the Impatient

Just showed this in class. I've never seen anyone so excited about vector addition. 😀 🎢 🍎 ♾️

Uncanceled Units xkcd.com/3038

Sun Avoidance xkcd.com/3029

It's Winter Solstice! Earth's 23.4° tilt and position in orbit mean the northern hemisphere gets the fewest daylight hours under the least intense sunlight of the year.

Today, Earth is on the left of the video below!

The eight planets of our Solar System 🔭

What particle are you?

Fascinating #astronomylive tonight hosted by @natural-history.bsky.social Hearing Astronaut John Herrington speak about his experiences in spaces and continued impacts was out of this world. Oh and seeing him play with OJ in microgravity was pretty neat too. #iteachphysics

The rotation periods of the planets, side-by-side

In case it is helpful to all you teachers, here is my...

Visibly Random Group Generator v7.3

🍎 Free, no ads
🍎 Set # of groups or group size
🍎 Checkboxes for absences
🍎 Add pairs of Ss that can't work together, be alerted of conflicts
🍎 Editable names & color to match classroom

Link in reply

🧬🥽🎢♾️

Astronomy Status Board xkcd.com/2469