Dr. Phil Metzger, Discover and Read the Best of Twitter Threads by @DrPhiltill

Dr. Phil Metzger

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From the talk I gave at the ASCE Earth & Space conference today. When you land on the Moon, your rocket exhaust is faster than lunar escape velocity and there

Since this Guardian writer has recycled the super-uninformed claim "we ought to be spending the money on Earth instead," it is now time to recycle the informed responses. (1) Hardly

1/n. We were discussing this comic by @xkcd while examining simulated lunar regolith, today. It came from this great piece about research by physicist Dr. Karen Daniels on why SAND

I was in Home Depot and saw the Farmer’s Almanac in the checkout line so I snapped this. Almanacs since the 1600s have been publishing lists of planets. It is

1. Pluto is an oddball: it doesn't clear its orbit.2. Mercury is an oddball: it doesn't have an atmosphere.3. Venus is an oddball: it spins retrograde.4. Earth is an oddball:

I thought I would point out a few of the cool, but maybe unnoticed, phenomena that occur in this video. Here goes! ...1/nhttps://twitter.com/hdanchiano/status/1303798487830728705 1. It is lucky that a big

I estimated it would take 40 years at $7 billion per year to create a fully closed supply chain off-Earth ("closed" = it can replicate its factories w/o anything launched

A visit from @deneigebroom @WFTV interviewing Gigi about her #breastcancer and running the virtual @bostonmarathon Sept 12. Gigi’s story is inspiring and we hope people will come cheer her race,

Interestingly, that was not the first article where science journalist Martha G. Morrow mentioned the public's idea of a "planet". In 1943, there was a claimed discovery of an exoplanet

Showing how concepts change, here's a delightful Science News article from 1951: "Not just nine, but thousands of planets are known to circle our sun. Most of them are tiny

When I was growing up in a NASA KSC bedroom community during the Apollo program, everybody’s parents including mine worked at “the Cape”, and life was saturated with space. The

Even though a flame trench is made of concrete and bricks, it is a technological marvel of rocket science. We pay rocket scientists with sophisticated computer modeling to help design