RaymondSummers

The first thing to point out is that in 2012, astronomers analyzed the motion of the Andromeda galaxy observed by the Hubble Space Telescope from 2010 to 2012, officially confirming that the two galaxies are bound to collide. Based on Andromeda's lateral velocity, it is estimated that the two galaxies will meet in about 3.75 billion years. How valuable is NASA's information this time? The first thing to be sure is that the halo is just a huge, though relatively thin, cloud of gas wrapped around the galaxy's periphery, which can extend to great distances. The Milky Way also has a huge halo, and if you look at the fusion between the halos, the two galaxies have already collided. So the halo collision does not represent a collision between two galaxies, and the data suggest that the actual collision will take place 3 billion years from now. Andromeda galaxy colliding with the Milky Way Galaxy is a foregone conclusion in the future, so what will happen to Earth? First of all, it's not a disaster movie, it's not that scary, this kind of galaxy collision is fairly common in the universe. In fact, such interstellar collisions do not involve physical contact between the stars and other objects contained in the galaxy. In other words, galaxies themselves are very diffuse-proxima Centauri, the nearest star to the Sun, is about 30 million times the diameter of the Sun. That is, after the Andromeda galaxy collides and the Milky Way even merges in 3 billion years, the best we can see from Earth is Andromeda's stars.

Scientists have discovered a black hole big enough to fit the entire solar system inside! You can imagine if a black hole with a bigger mass and a bigger diameter could really act like a kingdom of its own. Current cosmological theory holds that our universe was born in a "Big Bang" and then expanded exponentially, eventually morphing into the universe we see today. However, some researchers think our universe itself could be a giant black hole. Based on this theory, human civilization appears to be "imprisoned" in black holes: black holes are among the most mysterious objects in the universe, and many of their physical properties and space-time characteristics remain unknown

Jupiter's four largest moons, discovered 400 years ago by Galileo Galilei, are IO, Europa, Ganymede Ganymede and Callisto. Their worlds are fascinating, and some of them hide oceans that could harbor life. Scientists say the Juno probe has detected FM radio signals from one of the giant moons. Where did the signal come from? What other secrets are Jupiter's other moons hiding? The Juno spacecraft is still roaming through space, and for the first time since its launch, it has received FM radio signals from Jupiter's moon Ganymede, which can also be found on Earth. In fact, we use this signal every day, just like our Wi-Fi. Ganymede is the largest moon in the entire solar system, and if it orbits the Sn, it would itself be a planet larger than Mercury. Ganymede has no atmosphere and is the only moon known to have a powerful magnetosphere, which sometimes produces auroras influenced by a salty ocean beneath the moon. These wobbly aurora sightings gave researchers evidence that Ganymede's underground ocean may be liquid and much saltier than earth's oceans. The FM signals from Ganymede come from electrons in an electromagnetic field, a process that causes the electrons to spin and oscillate at speeds far below their spin speed. The Juno probe detected a five-second radio burst in late 2020 as Ganymede passed through Jupiter's polar region, where the gas giant's magnetic field interacts with it. Could there be life on Ganymede? We're sure the signal isn't from alien life. It's cold on Ganymede, around -121 degrees Celsius, but during a flyby, the Galileo probe detected a dense stream of hydrogen atoms escaping from the moon's thin atmosphere. That means there's a lot of oxygen, locked up or suspended on its icy surface, hydrogen atoms are the lightest atoms, and Ganymede has a weak gravitational field, so hydrogen escapes and atomic oxygen stays on the surface. Some researchers think there could be as much oxygen on Ganymede's icy surface as there is on Earth if conditions were right for life in ganymede's underground ocean. Some scientists think the pressure at the bottom of any ocean would be so high that it could turn into ice, but more discoveries are needed, though this moon is not the best candidate for life.

Earth is the third planet from the sun and the only body known to harbor and support life. About 29.2% of the earth's surface is made up of continents and islands. The remaining 70.8 percent is covered by water, mostly by oceans, bays and other bodies of salt water, but also by lakes, rivers and other bodies of fresh water, which together make up the hydrosphere. Most of the polar regions of the earth are covered in ice. Earth's outer layer is divided into several rigid tectonic plates that have migrated across the surface over millions of years, while its interior remains active, with a solid iron core, a liquid outer core that generates the Earth's magnetic field, and a convective mantle that drives plate tectonics. The earth's atmosphere consists mainly of nitrogen and oxygen. The tropics receive more solar energy than the polar regions and redistribute it through atmospheric and ocean circulation. Greenhouse gases also play an important role in regulating surface temperatures. An area's climate is determined not only by latitude, but also by factors such as altitude and proximity to the area and the ocean. Tropical cyclones, thunderstorms, heat waves and other severe weather occur in vast areas, which have a great impact on people's lives. Earth's gravity interacts with other objects in space, especially the moon, which is Earth's only natural satellite. The earth takes about 365.25 days to make one revolution around the sun. The earth's axis of rotation is tilted relative to the plane of its orbit, creating seasons on earth. Gravitational interactions between earth and the moon cause tides that stabilize earth's orientation on its axis and gradually slow its rotation. The earth is the common home of mankind. There is only one earth for mankind.

The Milky Way, our solar system's barred spiral galaxy (a type of spiral galaxy), is an elliptical disk with a large disk structure. New research shows that the Milky Way has four well-defined and fairly symmetrical spiral arms, 4,500 light-years apart. The Milky Way has between 100 and 400 billion stars. The Galaxy as a whole rotates poorly. The sun spins at a speed of about 220 kilometers per second at the center of the sun, which orbits the galactic center for about 250 million years. The Milky Way has a visual absolute magnitude of -20.5 and the total mass of the Milky Way is about 1.5 trillion times the mass of the Sun. The Milky Way galaxy is about 10 billion years old, while science believes the Big Bang happened about 13.8 billion years ago. The Milky Way has two companion galaxies: the Large and small Magellanic Galaxies. They are both members of the Local group of galaxies and part of the Virgo supercluster. Which in turn is part of the Raniacea supercluster. The Milky Way is composed of a silver center, a silver core, a silver disk, a silver halo and a silver corona. The central region of the Milky Way galaxy is dominated by old stars (mostly white dwarfs), while the outer region is dominated by new and young stars. A dozen satellite galaxies dot an area of hundreds of thousands of light-years, and the Milky Way grows by slowly gobbling up dwarf galaxies around it.

Jupiter is the fifth planet to the Sun and the largest planet in the solar system. As of 2019, Jupiter has 79 known moons. Jupiter is a giant planet, one thousandth the mass of the Sun, but two and a half times as massive as the rest of the solar system combined. Jupiter's main composition is hydrogen, but helium, which is only a tenth of a molecule, makes up a quarter of its mass. It may have a rocky core and heavy elements, but no solid surface that can be clearly defined. Jupiter has the appearance of an oblate sphere due to its rapid rotation. The atmosphere is divided into zones and bands depending on latitude, with turbulence and storms at each other's boundaries. The most striking example is the Great Red Spot, a massive storm that has not stopped since it was first seen by telescopes in the 17th century. Jupiter is also surrounded by faint planetary rings and a powerful magnetosphere, including four galilean moons discovered in 1610 and 79 as of December 2019. Ganymede is the largest, with a diameter larger than mercury of the planets. The early flybys were two each of the Pioneer and Voyager missions, followed by Galileo and Juno, which circled Jupiter, and New Horizons, which used Jupiter's gravity to accelerate to Pluto. There will still be plenty of space missions to explore Jupiter's system.