What are some cool facts about space that most people don't know?

 

1. All planets and satellites are spheroidal??

NO. Satellites of Mars, Phobos and Deimos are are very uneven in shape. All the celestial object which stay in space for a long time turns spherical ( or ellipsoidal) due to effect of gravity ( nature loves symmetry). This might be because the satellites are captured from nearby asteroid belt which are not essentially spherical. Also satellite of neptune, Proteus is not symmetrical.

2. Hottest planet

Venus. Yes, though Mercury is closer to sun but its not the hottest, it is so because atmosphere of Venus contains high amount of carbon Di oxide. Which causes extensive green house effect (No wonder why women are from Venus).

3. High magnetic field of Jupiter

Jupiter's magnetic field is result if its gravitational forces. Jupiter mainly consists of hydrogen as main element. Gravitational force is so high here that hydrogen atoms fuse and show metallic nature. This causes high magnetic field.

4. Density of Saturn

Density of Saturn is 687 kg per meter cube. That's less than water. Hence it will actually float in water.

Saturn also has polar flattening of 0.098 which is highest in solar system. This basically means its very much away from being spherical. Or say it has very high equatorial buldging.

5. Rotation period of greater planets

Greater planets like Jupiter, saturn, Uranus and neptune have very low rotational periods. That is they rotate at very high speed. For example rotation period of Uranus is 0.720 days ( that is 72% of earths day) that is around 17 hours.

6. Not all natural satellites originated from their primary planet.

There are satellites of distant planets of our solar system ( like Nereid of Neptune) which were captured from outer solar system into Neptune's orbit.

It can be seen by their unusual orbit around the Neptune that they were captured.

7. Pluto has three satellites.

Yes our small and fallen brother has three satellites. More than us. One of which, Charon is quite big relative to its primary planet (10–15% of Pluto's mass). Other two are recently discovered ( 2005 P1 and 2005 P2).

8. Satellites of Jupiter.

Largest satellite of our solar syastem., ganymede is larger than mercury and Pluto. Its radius is 2631 km.

Thanks.

Source- my syllabus book, of course.

Image source- solar walk lite android app.

What are some cool facts about Russia?

 Mostly from the top of my head:

• Russia has 11 time zones.
• Upon successfully invading Russia and conquering St. Petersburg (then called Leningrad), Hitler actually planned to hold a large celebration in a restaurant called the Hotel Astoria. The restaurant still stands today.
• The deepest and largest freshwater lake in the world is Lake Baikal, located in the south of Siberia, with a depth of 2,442 ft (744.4 m) and a shore length of 1,300 mi (2,100 km). It’s very beautiful. And look at those gorgeous methane bubbles!

• Tetris, arguably the famous puzzle video game of all time, originated in Russia (specifically the USSR). It was developed in 1984 by the artificial intelligence researcher Alexey Pazhitnov, and its first playable version was completed while he was working for the Soviet Academy of Sciences. Its theme music is also based on a Russian folk song, called “Korobeinki”.
• The Hermitage Museum in St. Petersburg has cats patrolling the basements to rid them of mice. That practice originates in the 18th century, from the times of the Empress Elizabeth of Russia, who was also Peter the Great’s daughter, who made sure that domestic cats be placed in the palace to control the ongoing mice infestation that filled the basements and kitchens. It worked out well, so the queen decided to let them remain there, doing their job keeping the palace rodent-free (and adorable as well). The cats have remained on the grounds since then, with the exception of a few dangerous periods such as WWII.

• Subbotnik, typically occurring around the weekends, were days of unpaid volunteer work in which the residents of cities and towns would help each other out and work together to tidy the streets. It was more common during the Soviet era, but is still practiced in some Russian cities today.
• The word “vodka” comes from вода (voda), meaning “water”.
• Serfdom was abolished in the Russian Empire in 1861, only four years before slavery would come to be abolished in the US in 1865.
• The reason why the Red Square in Moscow is called that way has nothing to do with the Soviet Union. The word красный, or krasniy, in archaic Russian meant not only “red”, but also “beautiful”. In addition, that word was only applied to a handful of buildings in the square, such as its main tower, for example.

What are some cool facts about Russia?

 1 ) The most beautiful metro in the world is definitely in Moscow, Russia.

2 ) Annually, 500,000 people are dying in Russia due to crimes and illnesses provoked by alcohol.

3 ) In 2009 Gorbachev recorded an album of Russian romantic ballads.

4 ) The first Russian child to receive the vaccine against smallpox was called "Vaccinov“.

5 ) The motto of Russia's nuclear strike missile force is: "After us is silence."

6 ) In September 1998, eight thousand teachers from Altai Republic, Siberian Federal District were paid in vodka.

7 ) In the 18th Century, a woman from Russia gave birth to 69 kids, 16 pairs of twins, 7 sets of triplets and 4 sets of quadruplets in just 40 years.

8 ) In 1698 Peter the Great, the Emperor of Russia, established a tax on beard. If you wanted to wear a beard you had to pay two half-kopeks every time you entered a city if you were a peasant and 100 rubles per year if you were a rich merchant.

P.S. I really don’t know why Putin doesn’t have a beard. Someone should tell him.

SOURCES :

https://www.rbth.com/arts/2017/06/19/dont-miss-these-5-stations-on-the-moscow-metros-circle-ring_785407

The ornate beauty of Moscow's metro stations

Alcohol Kills 500,000 Russians Annually

Mikhail Gorbachev's CD of romantic ballads sold at 165,000 dollars

Strategic Missile Troops - Wikipedia

Most prolific mother ever

48 Facts about Russia ←FACTSlides→

What is the coolest fact you know?

 Presenting random facts :

• When two waves meet :

This strange pattern at sea is what happens when two wave systems cross each other at nearly perpendicular angles. This can occur when waves generated by one weather system collides with waves generated by another weather system, usually at a place that is far away from both weather systems.

• For those who jumped from the WTC on 9/11/2001, the fall lasted 10 seconds. They struck the ground at just under 150 MPH – not fast enough to lose consciousness while falling, but fast enough to ensure instant death on impact. The deaths of those who jumped were ruled homicide, not suicide.
• The five oldest known companies all started in Japan. The oldest being more than 1400 years old. Worldwide there are more than 5500 companies that have been operating for 200+ years.
• There is a real life Hobbit village exists in New Zealand.( see the pics)

What's a cool math fact you can easily tell a layman and look super cool?

 

• You can get any real number from $0$ to $\infty$ by using only four 4 digits$(4,4,4,4)$. For example
• $(4+4)-(4+4)=0$
• $(4÷4)÷(4÷4)=1$
• $(4÷4)+(4÷4)=2$
• $(4\times 4-4)÷4=3$, and son on…
• Click here for details

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• Look at this expression. ${(1+9^{-4^{6\times 7}})}^{3^{2^{85}}}$

• The above expression contains every digit from $1$to $9$
• Now take out a calculator and solve the expression. You will get approximately $\mathrm{2.718281828459.}$Which is value of $e$(Euler's number)

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• Magic of Digit $9:$
• Divide $1$ by $9^2$. You will get every single digit from $1$ to $9$ after decimal point except $8$.
• $\frac{1}{9^2}=0.012345679012345679\cdots$
• The missing number $8$ in the sequence is first digit of $81$ which is $9^2$
• Divide $1$ by ${99}^2$. You will get every two digit number from $00$to $99$ except $98$.
• $\frac{1}{{99}^2}=0.00,01,02,03,04,05,06,07,\cdots ,96,97,99,00,01,02,\cdots$
• The missing number $98$ is first two digit of $9801$ which is ${99}^2$
• Divide $1$ by ${999}^2$. You will get every two digit number from $00$to $999$ except $988$.
• $\frac{1}{{999}^2}=0.000,001,002,003,\cdots ,996,997,999,000,001\cdots$
• The missing number $988$ is first three digit of $988001$ which is ${999}^2$
• Isn’t it cool?

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• Infinity ($\infty$)
• When you think of infinity, the only thing that might hit on you brain is that the infinity is largest number. Well that is not true.
• When you move towards right direction on number line, you get closer to the $\infty$. While, when you move towards left, you again get to $\infty$. Most people think that the infinity is infinity, whether it on left side of number line or on right side. Well it is not true. The right infinity ($+$$\infty$) is largest possible value while left infinity ($-\infty$) is smaller than every number except $0.$

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• largest Prime Number :
• The largest prime number discovered so far is $2^{74207281}-1.$
• Professor Curtis Cooper discovered this number. He used 800 university computers to work on this project .
• This number contains over 22 million digits. More precisely $22,338,618$ digits.
• The book on which that number is printed contains three volumes and is available to buy. Good opportunity for book readers.
• This number is 5 million digits longer than previously discovered largest prime number which was also discovered by Professor Curtis Cooper. He held this record four times. yeah! he is Captain Prime.
• The computers took months to check if this number is prime or not. Imagine doing this for countless numbers.
• Isn’t it super cool?

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• Why $0!=1$ & why Factorial of negative number is not defined:
• Let’s take $5!$ for instance. We know that $5!=\frac{6!}{6}=120.$ Let’s write a pattern by following same logic.
• $4!=\frac{5!}{5}=24$
• $3!=\frac{4!}{4}=5$
• $2!=\frac{3!}{3}=2$
• $1!=\frac{2!}{2}=1$
• Now comes $0$
• $0!=\frac{1!}{1}=1$
• Edit : This is not a perfect proof.
• So mystery solved…
• Now get towards negative numbers by following same pattern …
• $-1!=\frac{0!}{0}=\frac{1}{0}=\infty$ (OMG)
• Read next fact to know why $\frac{1}{0}=\infty$

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• Edit : More facts are coming. Let me think for a while…

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Edit : Here comes another one

• Why any number divided by $0$ is $\infty$?
• Let’s take an example of $\frac{16}{4}$ for instance.
• To divide $16$ by $4$, we subtract $4$ from $16$ until we get zero $0.$
• $16-4=12$ , $12-4=8$ , $8-4=4$, $4-4=0$ , We got zero…
• So, the number of times we subtracted 4 from 16 is the answer of $\frac{16}{4}$
• $\therefore \frac{16}{4}=4$ ($\because$ subtraction was 4 times)
• Now do the same for $\frac{25}{5}$ for another example
• Subtract $5$ from $25$ until we get zero
• $25-5=20$ , $20-5=15$ , $15-5=10$ , $10-5=5$ , $5-5=0$
• We did the subtraction five times. So the answer is $\frac{25}{5}=5$
• Now let’s move on with $0$
• Let’s take $20$ and divide it with $0$ by following above method
• Subtract $0$ from $20$ until we get $0$
• $20-0=20$ , $20-0=20,20-0=20,20-0=20,20-0=20,20-0=20,20-0=20,20-0=20,$ whoop
• So, We will get zero $0$ by subtracting $0$ from 20 for infinity times
• Therefor $\frac{20}{0}=\infty$

Now you can look super cool by telling these facts…