Infinity-Science

The opposite of black holes are estimated to be white holes which spray out matter and light like fountains.

The saying 'once in a blue moon ' refers to the occurrence of two full moons during one calendar month. The last two occurred in January & March 1999.

To a distant observer a clock near a black hole would appears to tick more slowly, this is gravitational time dilation. To the same observer, an object falling into a black hole would appear to slow down as it approached the event horizon, taking an infinite amount of time to reach it

If we put a giant mirror 10 light years away from Earth and looked at it through a telescope, theoretically we'd see 20 years into the past.

“moons,” with lowercase m’s. The terrestrial planets are relatively small worlds, composed primarily of rock and metal. All of them have solid surfaces that bear the records of their geological history in the forms of craters, mountains, and volcanoes. The next four planets (Jupiter through Neptune) are much larger and are composed primarily of lighter ices, liquids, and gases. We call these four the jovian planets (after “Jove,” another name for Jupiter in mythology) or giant planets —a name they richly deserve. More than 1400 Earths could fit inside Jupiter, for example. These planets do not have solid surfaces on which future explorers might land. They are more like vast, spherical oceans with much smaller, dense cores.

Overview of Our Planetary System The solar system The generic term for a group of planets and other bodies circling a star is planetary system . Ours is called the solar system because our Sun is sometimes called Sol . Strictly speaking, then, there is only one solar system; planets orbiting other stars are in planetary systems. consists of the Sun and many smaller objects: the planets, their moons and rings, and such “debris” as asteroids, comets, and dust. Decades of observation and spacecraft exploration have revealed that most of these objects formed together with the Sun about 4.5 billion years ago. They represent clumps of material that condensed from an enormous cloud of gas and dust. The central part of this cloud became the Sun, and a small fraction of the material in the outer parts eventually formed the other objects. During the past 50 years, we have learned more about the solar system than anyone imagined before the space age. In addition to gathering information with powerful new telescopes, we have sent spacecraft directly to many members of the planetary system. (Planetary astronomy is the only branch of our science in which we can, at least vicariously, travel to the objects we want to study.) With evocative names such as Voyager, Pioneer, Curiosity , and Pathfinder, our robot explorers have flown past, orbited, or landed on every planet, returning images and data that have dazzled both astronomers and the public. In the process, we have also investigated two dwarf planets, hundreds of fascinating moons, four ring systems, a dozen asteroids, and several comets (smaller members of our solar system that we will discuss later). Our probes have penetrated the atmosphere of Jupiter and landed on the surfaces of Venus, Mars, our Moon , Saturn’s moon Titan, the asteroids Eros and Itokawa, and the Comet Churyumov-Gerasimenko (usually referred to as 67P). Humans have set foot on the Moon and returned samples of its surface soil for laboratory analysis . We have even discovered other places in our solar system that might be able to support some kind of life. The Sun, a star that is brighter than about 80% of the stars in the Galaxy, is by far the most massive member of the solar system. It is an enormous ball about 1.4 million kilometers in diameter, with surface layers of incandescent gas and an interior temperature of millions of degrees. Beside Earth, five other planets were known to the ancients—Mercury, Venus, Mars, Jupiter, and Saturn—and two were discovered after the invention of the telescope: Uranus and Neptune. The eight planets all revolve in the same direction around the Sun. They orbit in approximately the same plane, like cars traveling on concentric tracks on a giant, flat racecourse. Each planet stays in its own “traffic lane,” following a nearly circular orbit about the Sun and obeying the “traffic” laws discovered by Galileo, Kepler, and Newton. Besides these planets, we have also been discovering smaller worlds beyond Neptune that are called trans-Neptunian objects or TNOs. The first to be found, in 1930, was Pluto , but others have been discovered during the twenty-first century. One of them, Eris , is about the same size as Pluto and has at least one moon (Pluto has five known moons.) The largest TNOs are also classed as dwarf planets, as is the largest asteroid, Ceres. To date, more than 1750 of these TNOs have been discovered. Each of the planets and dwarf planets also rotates (spins) about an axis running through it, and in most cases the direction of rotation is the same as the direction of revolution about the Sun. The exceptions are Venus , which rotates backward very slowly (that is, in a retrograde direction), and Uranus and Pluto , which also have strange rotations, each spinning about an axis tipped nearly on its side. We do not yet know the spin orientations of Eris, Haumea, and Makemake. The four planets closest to the Sun (Mercury through Mars) are called the inner or terrestrial planets . We generally call Earth’s satellite “the Moon,” with a capital M, and the other satellites

Overview | Pluto Moons – NASA Solar System Exploration https://solarsystem.nasa.gov/moons/pluto-moons/overview/?page=0&per_page=40&order=name+asc&search=&condition_1=99%3Aparent_id&condition_2=moon%3Abody_type%3Ailike

Fact check: Is world going to end on June 21 according to Mayan calendar? - Republic World https://www.republicworld.com/amp/fact-check/viral/fact-check-is-the-world-going-to-end-on-june-21.html

Fact check: Does the planet named Niburu which 'Will destroy Earth' actually exist? - Republic World https://www.google.com/amp/s/www.republicworld.com/amp/fact-check/viral/fact-check-does-the-planet-named-niburu-exist.html?espv=1

Watch "Solar Eclipse in June 21 What will happen in Ethiopia? |Bonie Aman" on YouTube https://youtu.be/C-xmpEOzd0U

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When Jupiter was formed it was much hotter and twice the size it is now, it continues to shrink at a rate of 2 centimetres per year due to heat radiation

In the first tiniest fraction of a second after the Big Bang, the new universe had expanded to the size of the solar system

Most of the elements found in the human body originated in stars; we are literally made of stardust.

Jupiter is the fastest rotating planet in the solar system, and huge at over 11 times as wide as the Earth. It rotates so fast that its poles are flattened and the planet bulges out at the equator. Its day is just 10 hours in length

The fastest spinning pulsar known is PSR J1748-2446ad, it is less than 16km across, but just under twice the mass of the Sun. It is spinning at 70,000 km per second at its equator, 24% the speed of light

https://t.me/joinchat/NVtz5BRVjxYSsTCN84VSvQ If you want more on physics and astronomy here is our discussion group casopia astro club. Let's explore the universe in our mind

The centre of the Milky Way galaxy is about 26,000 light years, or roughly 245 quadrillion (245,000,000,000,000,000) kilometres. Our next closest galaxy is the Andromeda Galaxy, which is about 2.5 million light years away, or roughly 26,000,000,000,000,000,000 kilometres. The best estimate of the size of the observable universe (given that it has been expanding for 13.7 billion years), is about 156 billion light years (1,560,000,000,000,000,000,000,000 kilometres) across.