@neiltyson Yo is it true that, even tho there are 7 billion more people today than 3 million years ago, that the world weighs the same now??
-
-
Does the gain in mass alter our orbit? Will we crash into/drift away from the sun?
-
Gnats on the back of an elephant are 10-billion times heavier, relative to the elephant than a day’s accumulation of meteors are to Earth
- 1 more reply
New conversation -
-
-
That is the example (question) I tell (ask) my students every year when teaching law of conservation of mass. Don't ruin it please

-
"Has the Earth's mass ever changed since it had been a planet?"
- 1 more reply
New conversation -
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
How do you even weigh a planet?
-
Here's 1 way: You can measure the speed, distance & mass of the orbiting ISS. The first 2 tell us the gravity force applied. - - >
-
You then can calculate mass with fancy equations. But that's just mass. If you want weigh you need a point of reference like the Sun.
-
But you need to know the mass of the point of reference. With the sun, we could calculate its mass using the amount of radiation I guess.
-
All this assumes there are no other celestial bodies (or they don't interfere much). But it is possible to detect the trend
@neiltyson says.
End of conversation
New conversation -
-
-
Can you help me with my thermo homework?
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
Earth's mass: 5.972 × 10^21 Mg. Even 500 tons/d (~500 Mg) would be only ~180 × 10^3 Mg/y. The people: biomass of other species mainly.
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
I fucking love you man. I needed that on this Friday night. Keep on keeping on; Live, Love, and Learn.
- 1 more reply
New conversation -
-
-
I have no doubt that you are correct, but I am perplexed as to how that could be measured.
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
-
-
The earth gets heavier as Trump's hair gets longer.
#FACTSThanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.