9 of the Universe's Most Uninhabitable Planets
3,012Earthlike worlds & the strangest planets in the solar system. These are the universe's most uninhabitable planets.
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Number 9 Hoth
Nicknamed Hoth, after the fictional planet in Star Wars, OGLE-2005-BLG-390Lb is located near the center of the Milky Way. It’s one of the coldest and most distant planets known in our galaxy. What makes Hoth notable is how far it’s located from its star, with an orbital period of approximately 10 years. The planet doesn’t appear to meet the necessary attributes for sustaining life. This is mainly because of its extreme surface temperature, which reaches about -370 Fahrenheit. This is roughly four times lower than the lowest surface temperature ever detected on Earth.
Number 8 Kepler-1b
Kepler-1b, like Hoth, is an exoplanet, meaning that it’s located outside our Solar System. The most notable aspect about Kepler-1b is that it reflects less than one percent of the light that hits it. It’s the darkest known exoplanet and the reason for that is still a mystery. One theory is that it’s due to the absence of reflective clouds, like those that make Jupiter so bright. Whatever the case may be, Kepler-1b is unhospitable because of the high proximity to its parent star and the scorching surface temperature.
Number 7 Jupiter
It’s a gas giant, meaning that it lacks a well-defined solid surface. Rapid rotation is what gives the planet its somewhat spherical shape. This is the largest storm in the Solar System. It’s not, however, the only storm on Jupiter. Others rage throughout the planet, with winds of over 400 miles per hour and enormous lightning bolts, 100 times brighter than those on Earth. At greater depths, hydrogen, which accounts for most of Jupiter’s composition, turns into a liquid metal due to a combination of pressure and heat.
Number 6 HD 189733 b
Located about 64.5 light years from our Solar System, HD 189733 b is known as a hot Jupiter. These planets are physically similar to Jupiter but have a much shorter orbital period, usually of less than ten days. The proximity to the star they orbit also means that surface temperatures are extremely elevated. The planet’s color has been determined as being deep blue, the result of light-reflecting silicate particles in its atmosphere. Because of the planet’s temperature, the particles are believed to condense and form glass. The glass is swept through the atmosphere by winds of up to seven times the speed of sound.
Number 5 KELT-9b
KELT-9b is, simply put, one of the hottest planets in the known universe. The planet’s atmosphere mainly consists of hydrogen and it’s slowly being consumed by the planet’s parent star. If a human being somehow made it to the surface, they would be incinerated and disintegrated at the same time.
Number 4 Gliese 436 b
Gliese 436 b is known as “the planet of burning ice”. It’s located very close to its orbiting star, at about 2.5 million miles. The immense gravitational force from the planet’s core keeps water from evaporating, despite a surface temperature of roughly 822 degrees Fahrenheit. Just like carbon turns to diamond, with the proper temperature and pressure, so does water on Gliese 436 b turn to “burning ice”. Naturally, the blazing sphere of ice baffled scientists when it was first examined in the mid-2000s. The mysteries don’t end here.
Number 3 PSR J1719−1438 b
From that perspective, this is one of the fastest planets in the known Universe. PSR J1719-1438 b orbits its host star so closely that its entire orbit could fit into our Sun. It completes its cycle in a little over 2 hours and at a distance of roughly 400,000 miles from its star.
Number 2 Venus
Temperatures reach close to 870 degree Fahrenheit, making it by far the hottest planet in our Solar System. Unlike many other terrestrial planets, even Venus’ poles are smoldering. The atmospheric pressure at surface level is 92 times that of Earth. It’s the rough equivalent of what you’d experience at a depth of 3,000 feet underwater.
Number 1 Mars
They can strike a small area or cover the entire planet. These are only a few of the issues that must be addressed before we can even think about inhabiting the planet.
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