Apparently even NASA is wrong about which planet is closest to Earth
Three scientists publish a paper proving that Mercury, not Venus, is the closest planet to Earth.
- Earth is the third planet from the Sun, so our closest neighbor must be planet two or four, right?
- Wrong! Neither Venus nor Mars is the right answer.
- Three scientists ran the numbers. In this YouTube video, one of them explains why our nearest neighbor is... Mercury!
Did Musk pick the wrong planet to die on?
Elon Musk has said he wants to die on Mars.
By 2024, Elon Musk wants to land humans on Mars – the billionaire entrepreneur has said that he himself wants to go to the Red Planet, and even wants to die there (just not on impact, he quips). But has SpaceX chosen the wrong planet to colonize? If the plan was to pick the closest planet: yes indeed.
While Mars looms large in human culture and imagination, most scientific sources refer to Venus as the planet that's the shortest distance away from Earth. NASA mentions Venus as our closest neighbor. But while it's true that no other planet comes closer – the shortest approach is 0.28 AU (1) or 25 million miles (41 million km) – it's not true that Venus is the closest planet (2) on average (even though that too is often erroneously asserted).
A faulty line-up of the solar system
A line-up of the usual suspects. Only the sizes are to scale, not the distances. And they usually don't line up as nicely as this.
"As it turns out, by some phenomenon of carelessness, ambiguity or groupthink, science popularizers have disseminated information based on a flawed assumption about the average distance between planets," write Tom Stockman, Gabriel Monroe and Samuel Cordner in an article published by Physics Today.
They go on to explain the mathematical method they devised to prove that, when averaged over time, it is in fact Mercury – the first rock from the Sun – that is Earth's nearest neighbor.
Long story short: Mercury is closest to Earth on average because it orbits the Sun more closely. That also means – mind-blowingly – that Mercury is the closest neighbor of all planets in our solar system, including gas giants Jupiter and Saturn and snowball planets Neptune and Uranus on the freezing outer edges of the system.
Unbelievably cool or unbelievably obvious?
Image: Tomment Section
Simulation of Mercury (grey), Venus (orange), Earth (blue) and Mars (red) circling the Sun, and the calculation of average distances to Earth.
In Physics Today, the three scientists describe their method in great detail. For laypeople like (probably) you and (certainly) me, the YouTube video at the top of this post, narrated by Mr Stockman, is more illuminating. In 6 minutes 40 seconds, he had me convinced.
While some commenters agree ("a neat new way to think about it!"), one or two are irritated that the hoi polloi are only now clocking on to this ("Any idiot should have been able to point this out").
Either way, one has to feel for the one commenter who seems to have figured this out a long time ago, but didn't have this video to prove their point: "I told my school teacher many years ago that Mercury is nearest to Earth but they laughed at me."
Strange Maps #966
Got a strange map? Let me know at firstname.lastname@example.org.
(1) 1 Astronomical Unit (AU) is the average distance between the Earth and the Sun: 93 million miles (150 million km).
(2) Their name aptly derived from the Greek 'planetai' for "wanderers", planets orbit around the Sun, hence the immense variation in the distances between them.
Upstreamism advocate Rishi Manchanda calls us to understand health not as a "personal responsibility" but a "common good."
- Upstreamism tasks health care professionals to combat unhealthy social and cultural influences that exist outside — or upstream — of medical facilities.
- Patients from low-income neighborhoods are most at risk of negative health impacts.
- Thankfully, health care professionals are not alone. Upstreamism is increasingly part of our cultural consciousness.
In most states, LGBTQ Americans have no legal protections against discrimination in the workplace.
- The Supreme Court will decide whether the Civil Rights Act of 1964 also applies to gay and transgender people.
- The court, which currently has a probable conservative majority, will likely decide on the cases in 2020.
- Only 21 states and the District of Columbia have passed laws effectively extending the Civil Rights of 1964 to gay and transgender people.
A new method promises to capture an elusive dark world particle.
- Scientists working on the Large Hadron Collider (LHC) devised a method for trapping dark matter particles.
- Dark matter is estimated to take up 26.8% of all matter in the Universe.
- The researchers will be able to try their approach in 2021, when the LHC goes back online.
No, depression is not just a type of "affluenza" — poor people in conflict zones are more likely candidates
- Often seen as typical of rich societies, depression is actually more prevalent in poor, conflict-ridden countries
- More than one in five Afghans is clinically depressed – a sad world record
- But are North Koreans really the world's 'fourth least depressed' people?
SMARTER FASTER trademarks owned by The Big Think, Inc. All rights reserved.