Young Mars featured a dense atmosphere and water resources💦
✨Yet, over the past billions of years, the Red Planet has lost much of both its gas envelope and its hydrosphere.
Nevertheless, Mars has still managed to retain some water in the form of subsurface ice deposits. Data collected by spacecraft suggest that they are much more widespread than previously thought.
According to some estimates, up to one-third of the planet contains hidden deposits of water ice✨
#Mars
👉 @AstroMechanics
✨Yet, over the past billions of years, the Red Planet has lost much of both its gas envelope and its hydrosphere.
Nevertheless, Mars has still managed to retain some water in the form of subsurface ice deposits. Data collected by spacecraft suggest that they are much more widespread than previously thought.
According to some estimates, up to one-third of the planet contains hidden deposits of water ice✨
#Mars
👉 @AstroMechanics
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Billionaire Richard Branson aims to send tourists to space thrice a month🚀
✨By 2023, his company plans to complete an upgrade of its launch vehicle and commission a second spacecraft✨
#Fact
👉 @AstroMechanics
✨By 2023, his company plans to complete an upgrade of its launch vehicle and commission a second spacecraft✨
#Fact
👉 @AstroMechanics
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Loop Quantum Gravity
✨LQG is a theory to unite Quantum Mechanics and General Relativity. In LQG space-time is a network The background of Einstein's theory of gravity is replaced by nodes and links to which Quantum Properties are assigned. In this way, space is built up of discrete chunks. LQG is in large part a study of these chunks✨
#QuantumGravity
👉 @AstroMechanics
✨LQG is a theory to unite Quantum Mechanics and General Relativity. In LQG space-time is a network The background of Einstein's theory of gravity is replaced by nodes and links to which Quantum Properties are assigned. In this way, space is built up of discrete chunks. LQG is in large part a study of these chunks✨
#QuantumGravity
👉 @AstroMechanics
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Why does the Moon "follow" us when we drive?
✨As we rush down the road, we notice how everything flies past us in the opposite direction: trees, houses, fences, the road. And from the Moon, too, we expect it to fly past us, or at least go backwards the farther forward we go. When it doesn't, we feel as if it is "following" us.
The Moon may not seem to be very far away from us, but the average distance from it to Earth is 384,400 km. This enormous distance explains why, when we drive a car and look at the Moon, it seems as if it is following us.
Compared to the distance our car travels in a few minutes, this distance is enormous. So as we drive, the angle at which we see the moon remains virtually unchanged. And while everything flies past us, there is a sense that the Moon is "following" us✨
#Fact
👉 @AstroMechanics
✨As we rush down the road, we notice how everything flies past us in the opposite direction: trees, houses, fences, the road. And from the Moon, too, we expect it to fly past us, or at least go backwards the farther forward we go. When it doesn't, we feel as if it is "following" us.
The Moon may not seem to be very far away from us, but the average distance from it to Earth is 384,400 km. This enormous distance explains why, when we drive a car and look at the Moon, it seems as if it is following us.
Compared to the distance our car travels in a few minutes, this distance is enormous. So as we drive, the angle at which we see the moon remains virtually unchanged. And while everything flies past us, there is a sense that the Moon is "following" us✨
#Fact
👉 @AstroMechanics
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First selfies in space
✨Buzz Aldrin took this photo against the Earth during the Gemini 12 mission in November 1966✨
#Fact
👉 @AstroMechanics
✨Buzz Aldrin took this photo against the Earth during the Gemini 12 mission in November 1966✨
#Fact
👉 @AstroMechanics
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✨The Cat's Eye Nebula is a planetary nebula formed after the death of a star with a mass approximately equal to that of the sun✨
#Cat'seyeNebula
👉 @AstroMechanics
#Cat'seyeNebula
👉 @AstroMechanics
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Astronauts on the ISS watch 15-16 sunsets and sunrises every day😱
✨The International Space Station is about 220 km above Earth and travels at 27,700 km/h.
This means that it orbits every 92 minutes. Therefore, the astronauts on board see sunsets and sunrises every 45 minutes✨
#Fact
👉 @AstroMechanics
✨The International Space Station is about 220 km above Earth and travels at 27,700 km/h.
This means that it orbits every 92 minutes. Therefore, the astronauts on board see sunsets and sunrises every 45 minutes✨
#Fact
👉 @AstroMechanics
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EARTH DAY🌍!
✨Earth Day is an annual event on April 22 to demonstrate support for environment. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EarthDay.org (formerly Earth Day Network) including 1 billion people in more than 193 countries✨
HAPPY EARTH DAY🌏!
👉 @AstroMechanics
✨Earth Day is an annual event on April 22 to demonstrate support for environment. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EarthDay.org (formerly Earth Day Network) including 1 billion people in more than 193 countries✨
HAPPY EARTH DAY🌏!
👉 @AstroMechanics
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What are Saturn's rings made of?
✨The size of particles in Saturn's rings is from micrometers to centimeters.
The composition of the main rings: water ice (about 99%) with admixtures of silicate dust.
The thickness of the rings is extremely small compared to their width (from 7 to 80 thousand kilometers above Saturn's equator) and ranges from one kilometer to ten meters.
The total mass of debris material in the ring system is estimated at 3 × 1019 kilograms✨.
#Saturn
👉 @AstroMechanics
✨The size of particles in Saturn's rings is from micrometers to centimeters.
The composition of the main rings: water ice (about 99%) with admixtures of silicate dust.
The thickness of the rings is extremely small compared to their width (from 7 to 80 thousand kilometers above Saturn's equator) and ranges from one kilometer to ten meters.
The total mass of debris material in the ring system is estimated at 3 × 1019 kilograms✨.
#Saturn
👉 @AstroMechanics
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May one have a cat on the ISS🐈?
✨Domestic animals on the ISS are an unacceptable luxury. They need oxygen, water, food, sanitary conditions. Moreover, the issue of fur flying everywhere will be very acute.
The poor animal will face a lot of trouble in space. Cats have well-developed vestibular apparatus, so that in microgravity conditions the tail will twist and turn like a whirligigig✨.
*The first cat in outer space is pictured here☝
#Fact
👉 @AstroMechanics
✨Domestic animals on the ISS are an unacceptable luxury. They need oxygen, water, food, sanitary conditions. Moreover, the issue of fur flying everywhere will be very acute.
The poor animal will face a lot of trouble in space. Cats have well-developed vestibular apparatus, so that in microgravity conditions the tail will twist and turn like a whirligigig✨.
*The first cat in outer space is pictured here☝
#Fact
👉 @AstroMechanics
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Western satellites are predicted to collapse 🛰
✨Academician Herbert Yefemov predicted the rapid deterioration of Western satellites - we are talking about more than 2,000 apparatuses of the American Starlink constellation and more than 400 apparatuses of the British OneWeb.
"In a decade, these satellites will break down, becoming just unmanageable junk and creating an unprecedented congestion of narrow orbital layers with space debris, with an uncontrollable increase in the number of collisions," he said.
Efremov also noted that satellite constellations will be renewed, and this, in turn, will lead to a further increase in the number of new devices on the Earth's orbit✨
#Satellites
👉 @AstroMechanics
✨Academician Herbert Yefemov predicted the rapid deterioration of Western satellites - we are talking about more than 2,000 apparatuses of the American Starlink constellation and more than 400 apparatuses of the British OneWeb.
"In a decade, these satellites will break down, becoming just unmanageable junk and creating an unprecedented congestion of narrow orbital layers with space debris, with an uncontrollable increase in the number of collisions," he said.
Efremov also noted that satellite constellations will be renewed, and this, in turn, will lead to a further increase in the number of new devices on the Earth's orbit✨
#Satellites
👉 @AstroMechanics
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Why can't we see stars during the day?
✨It's all because of the nearest star to us, the Sun.
Although the Sun is not the brightest or largest star, the distance between it and our planet is so small that sunlight literally floods the Earth, making all other weak light invisible✨
#Stars
👉 @AstroMechanics
✨It's all because of the nearest star to us, the Sun.
Although the Sun is not the brightest or largest star, the distance between it and our planet is so small that sunlight literally floods the Earth, making all other weak light invisible✨
#Stars
👉 @AstroMechanics
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What causes solar flares🌞?
✨These phenomena occur because the Sun has its own magnetic field. And flares occur in areas where magnetic fields of opposite polarity collide in a confined space.
Even though we already realize what solar flares are, scientists still can't predict when they will happen. So they commonly take us by surprise✨
#SunFlares
👉 @AstroMechanics
✨These phenomena occur because the Sun has its own magnetic field. And flares occur in areas where magnetic fields of opposite polarity collide in a confined space.
Even though we already realize what solar flares are, scientists still can't predict when they will happen. So they commonly take us by surprise✨
#SunFlares
👉 @AstroMechanics
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The direction of the tail of comet NEOWISE changed due to the Earth's motion
✨Like all comets, the blue ion tail is always directed away from the Sun.
Between July 17 and July 25, 2020 (when these images were taken) the Earth was moving in its orbit around the Sun, and because of this the Sun's position in the sky was also changed.
Consequently, the tail shifted✨
#TailOfComet
👉 @AstroMechanics
✨Like all comets, the blue ion tail is always directed away from the Sun.
Between July 17 and July 25, 2020 (when these images were taken) the Earth was moving in its orbit around the Sun, and because of this the Sun's position in the sky was also changed.
Consequently, the tail shifted✨
#TailOfComet
👉 @AstroMechanics
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The first-ever spacecraft collision occurred in 2009
✨The long-decommissioned Russian military satellite Cosmos-2251 collided in its orbit with the active American satellite Iridium-33.
Such collisions are now trying to be avoided as debris can threaten not only other satellites but also the ISS✨
#Spacecraft
👉 @AstroMechanics
✨The long-decommissioned Russian military satellite Cosmos-2251 collided in its orbit with the active American satellite Iridium-33.
Such collisions are now trying to be avoided as debris can threaten not only other satellites but also the ISS✨
#Spacecraft
👉 @AstroMechanics
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One of the first to suggest launching something like a satellite into space was the science fiction writer
✨In 1945, Arthur Clarkson suggested that a satellite could be placed in orbit in such a way that it would move in the same direction and at the same speed as the Earth. So-called "geostationary satellites" could be used for communications.
Scientists did not get Clarkson - until October 4, 1957✨
#Fact
👉 @AstroMechanics
✨In 1945, Arthur Clarkson suggested that a satellite could be placed in orbit in such a way that it would move in the same direction and at the same speed as the Earth. So-called "geostationary satellites" could be used for communications.
Scientists did not get Clarkson - until October 4, 1957✨
#Fact
👉 @AstroMechanics
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