β¨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 sunβ¨
#Cat'seyeNebula
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#Cat'seyeNebula
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β¨A very interesting UFO was spotted in Acapulco, Mexico on 21 November 2021π½
#UFO
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#UFO
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π€4π±4π₯2π1π€―1
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Astronauts on the ISS watch 15-16 sunsets and sunrises every dayπ±
β¨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 minutesβ¨
#Fact
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β¨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 minutesβ¨
#Fact
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EARTH DAYπ!
β¨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 countriesβ¨
HAPPY EARTH DAYπ!
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β¨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 countriesβ¨
HAPPY EARTH DAYπ!
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π2π±1π1
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What are Saturn's rings made of?
β¨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 Γ 1019 kilogramsβ¨.
#Saturn
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β¨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 Γ 1019 kilogramsβ¨.
#Saturn
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β€1π₯1π€1
May one have a cat on the ISSπ?
β¨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 whirligigigβ¨.
*The first cat in outer space is pictured hereβ
#Fact
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β¨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 whirligigigβ¨.
*The first cat in outer space is pictured hereβ
#Fact
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Western satellites are predicted to collapse π°
β¨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 orbitβ¨
#Satellites
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β¨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 orbitβ¨
#Satellites
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π1π±1
Why can't we see stars during the day?
β¨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 invisibleβ¨
#Stars
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β¨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 invisibleβ¨
#Stars
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π±2π1
What causes solar flaresπ?
β¨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 surpriseβ¨
#SunFlares
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β¨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 surpriseβ¨
#SunFlares
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The direction of the tail of comet NEOWISE changed due to the Earth's motion
β¨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 shiftedβ¨
#TailOfComet
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β¨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 shiftedβ¨
#TailOfComet
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π2π1π€―1
The first-ever spacecraft collision occurred in 2009
β¨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 ISSβ¨
#Spacecraft
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β¨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 ISSβ¨
#Spacecraft
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π1π±1
One of the first to suggest launching something like a satellite into space was the science fiction writer
β¨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, 1957β¨
#Fact
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β¨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, 1957β¨
#Fact
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π€1π±1
NASA plans to send a flagship mission to Uranus by 2049
β¨A committee of NASA scientists has recommended that a flagship mission to Uranus be NASA's highest-priority major planetary science mission for the next decade.
Uranus is a virtually unexplored world; NASA's only visit to the seventh planet was a short flyby on January 24, 1986, during which scientists discovered the planet's rings and several additional moons.
At this point, an orbiter and probe to Uranus is not a specific mission, but a conceptβ¨
#Astroinfo
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β¨A committee of NASA scientists has recommended that a flagship mission to Uranus be NASA's highest-priority major planetary science mission for the next decade.
Uranus is a virtually unexplored world; NASA's only visit to the seventh planet was a short flyby on January 24, 1986, during which scientists discovered the planet's rings and several additional moons.
At this point, an orbiter and probe to Uranus is not a specific mission, but a conceptβ¨
#Astroinfo
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Europeans explore caves on the Moonπ»
β¨For a long time, NASA representatives have been curious about the underground world on the Moon. The European Space Agency also began to study it. Specialists argue that the existing caves on our planet's satellite may be quite suitable for the construction of space bases.
It is no secret that the Moon has no atmosphere. Radiation on the surface is extremely high. In addition, meteorites that fall on the moon have nowhere to burn. Therefore, during the construction of various structures for the life of the colonizers must be protected.
According to researchers, the best option is the lunar caves. Also water and minerals can be found there, both of which are useful for life support of lunar basesβ¨
#MoonCaves
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β¨For a long time, NASA representatives have been curious about the underground world on the Moon. The European Space Agency also began to study it. Specialists argue that the existing caves on our planet's satellite may be quite suitable for the construction of space bases.
It is no secret that the Moon has no atmosphere. Radiation on the surface is extremely high. In addition, meteorites that fall on the moon have nowhere to burn. Therefore, during the construction of various structures for the life of the colonizers must be protected.
According to researchers, the best option is the lunar caves. Also water and minerals can be found there, both of which are useful for life support of lunar basesβ¨
#MoonCaves
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π₯2π±1
SDSS 153636.22+044127.0
β¨A binary black holes have been found sitting in the center of quasar SDSS 153636.22+044127.0 at a distance of about 4 billion light years from Earthβ¨
#Blackhole
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β¨A binary black holes have been found sitting in the center of quasar SDSS 153636.22+044127.0 at a distance of about 4 billion light years from Earthβ¨
#Blackhole
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What is the minimal size of black holes?
β¨The mass of a black hole formed by the collapse of a larger star is limited by the Oppenheimer-Volkoff limit. Its exact value is not known, as it depends on many poorly understood parameters. In general, this limit lies between 2.14 and 2.17 solar masses.
All stars lighter than 2.14 solar masses are definitely not black holes. The highly probable BH candidates known today have significantly higher masses, from 6 solar masses and higher.
For primary (small) black holes the lower value is the Planck mass: 2.176β 10^(-8) kg. But primary black holes are hypothetical objects and have not been discovered yetβ¨
#Blackhole
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β¨The mass of a black hole formed by the collapse of a larger star is limited by the Oppenheimer-Volkoff limit. Its exact value is not known, as it depends on many poorly understood parameters. In general, this limit lies between 2.14 and 2.17 solar masses.
All stars lighter than 2.14 solar masses are definitely not black holes. The highly probable BH candidates known today have significantly higher masses, from 6 solar masses and higher.
For primary (small) black holes the lower value is the Planck mass: 2.176β 10^(-8) kg. But primary black holes are hypothetical objects and have not been discovered yetβ¨
#Blackhole
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π2
Rigel (Beta Orion) are 4 stars that are visible in the sky as one bright blue dot
β¨The supergiant and three main-sequence stars rotate around a common center of mass with a period of 24 thousand yearsβ¨
#BrightBlueDot
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β¨The supergiant and three main-sequence stars rotate around a common center of mass with a period of 24 thousand yearsβ¨
#BrightBlueDot
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