Buzz
Although modern science has only scratched the surface of our understanding of outer space, what we do know is truly awe-inspiring. Here’s a compilation of the top 10 most fascinating facts about Space.
10. Surprisingly Light
Fact: If Saturn were placed in water, it would float.
Saturn has such a low density that it would float if placed in a massive glass of water. The density of Saturn is 0.687 g/cm³, whereas the density of water is 0.998 g/cm³. With an equatorial radius of 60,268 ± 4 km, you would need an enormous container of water to test this theory.
9. In Constant Motion
Fact: We are traveling through space at a remarkable speed of 530 kilometers per second.
The Milky Way galaxy rotates at a speed of 225 kilometers per second, and is also moving through space at 305 kilometers per second. This means that our combined velocity is 530 kilometers (330 miles) per second. In just one minute, we travel about 19,000 kilometers from where we started. Although scientists don't all agree on the precise speed of the Milky Way, with estimates ranging from 130 to 1,000 km/s, it's important to note that according to Einstein's theory of relativity, the concept of an object's speed through space has no absolute meaning.
8. Goodbye, Old Friend!
Fact: The Moon is slowly drifting away from Earth.
Each year, the Moon moves approximately 3.8 cm further from Earth due to tidal forces. As a result, Earth's rotation slows by about 0.002 seconds per day per century. While scientists are still unsure of how the Moon was formed, the most widely accepted theory is that a Mars-sized object collided with Earth, causing the Moon to break off.
7. Light from the Past
Fact: The light reaching Earth right now is 30,000 years old.
The energy in the sunlight we see today began its journey from the Sun's core 30,000 years ago. Most of this time was spent navigating the dense atoms of the Sun, but once it escaped, it only took 8 minutes to reach Earth! The Sun's core has a temperature of 13,600,000 kelvins. The energy created by fusion in the core has to travel through multiple layers before reaching the photosphere, where it finally escapes as sunlight or particle kinetic energy.
6. Solar Nutrition
Fact: The Sun sheds up to a billion kilograms per second due to solar winds.
Solar winds are streams of charged particles ejected from the Sun's upper surface, a result of the intense heat in the corona and the high kinetic energy particles acquire through a process that remains not fully understood. Also, did you know that a single pinhead of the Sun's energy could be lethal from a distance of 160 kilometers? [Sourced from Planet Science]
5. The Big Dipper is not a constellation
Fact: The Big Dipper is not actually a constellation, it is an asterism.
Although many people believe the Big Dipper is a constellation, it is actually an asterism. An asterism is a star pattern in the sky that doesn't belong to any of the official 88 constellations. These patterns are made up of stars that are not physically connected and may be separated by vast distances. Asterisms can consist of stars from multiple constellations. In the case of the Big Dipper, it is made up entirely of the seven brightest stars in the Ursa Major (Great Bear) constellation.
4. George's Star
Fact: Uranus was originally named George's Star.
When Sir William Herschel discovered Uranus in 1781, he had the honor of naming it. He decided to name it Georgium Sidus (George's Star) after his new patron, King George III (Mad King George). This is what he said:
In the ancient world, the planets were named after their most prominent heroes and deities, such as Mercury, Venus, Mars, Jupiter, and Saturn. Today, in our more scientific age, it would be unlikely to follow the same tradition by naming a newly discovered planet after figures like Juno, Pallas, Apollo, or Minerva. When a new planet is discovered in the future, it would be much more fitting to say, ‘It was discovered during the reign of King George the Third,’ than to use mythological references.
Uranus holds the distinction of being the first planet discovered with a telescope.
3. Cold Welding
Fact: If two pieces of metal come into contact in space, they will fuse together permanently.
It may sound unbelievable, but it’s actually true: when two uncoated metal pieces meet in the vacuum of space, they fuse together into a single piece. This doesn’t happen on Earth because the atmosphere creates an oxidized layer between the metal surfaces. While this could be a concern on the space station, most of the tools used there already have coatings. So far, the only instances of cold welding observed have been in experiments intentionally designed to provoke the reaction. This process is called cold welding. For those who doubt it, here is the Wikipedia article on Cold Welding.
2. Sunspot Music
Fact: Sunspot activity may be the key to the unique sound of Stradivarius violins.
Antonio Stradivari, regarded as the finest violin maker in history, lived in Italy during the 17th and 18th centuries. Although scientists have yet to determine the exact secret behind the unmatched quality of his violins, the wood used for crafting them plays a crucial role. During the Little Ice Age (1500s-1800s), caused by increased volcanic activity and reduced solar output (referred to as the Maunder Minimum), the trees Stradivari used grew slowly, making the wood exceptionally hard. Hardwood is a key factor in creating fine violins. Had Stradivari lived in a different era, it’s likely his violins wouldn’t be as treasured as they are today. The image above shows the tree rings of the spruce used to make the “Messiah” Stradivarius violin. The top row displays the thickness of each ring in millimeters (about the width of a fingernail), while the bottom row lists the years each ring was formed.
1. Extra Moons
Fact: Earth has at least four moons.
Well, this isn’t exactly the case, but it's pretty close. In 1986, Duncan Waldron discovered an asteroid measuring 5 kilometers across that follows an elliptical orbit around the sun, with a period of revolution almost identical to Earth’s. As a result, the planetoid and Earth seem to be traveling together. This periodic planetoid is named Cruithne (pronounced ‘krin-y’?), after an ancient group of Scottish people known as the Picts. Because of its unique relationship with Earth, it's sometimes called Earth’s second moon. Cruithne is much dimmer than Pluto, and spotting it would require a telescope with at least a 12.5-inch aperture. Since its discovery, at least three other similar asteroids have been found. Such objects are also found in comparable orbits around other planets in our Solar System. In the image above (courtesy of Paul Wiegert), Earth is represented by the blue circle with a cross, while Cruithne’s orbit is shown in yellow.
