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Astrophysics

Astrophysics is the scientific discipline concerned with the events that are taking place on the grandest of stages; the universe. Questions about the formation and evolution of the planets, solar systems, stars, and galaxies found within the universe, as well as questions regarding black holes, cosmic rays, particle and nuclear astrophysics, nucleosynthesis, and magnetohydrodynamics should be directed here.

500 Questions

A planet that has a day longer than it's year?

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A planet with a day longer than its year is called a "retrograde" or "tidally-locked" planet. This means that its rotational period is longer than its orbital period around its star. This phenomenon occurs when gravitational interactions with a nearby celestial body, such as a moon or a star, slow down the planet's rotation, causing it to have a longer day than year.

What planet has 13 known moons?

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Some sources say Neptune has 13 moons - others cite 14. The other gas giants all have more - Jupiter with 63, Saturn with 62, Uranus with 27 (depending on your source) so you could say all the above have at least 13.

What is the third motion of the earth and other planet?

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The third motion of the Earth and other planets is known as axial tilt or obliquity. It refers to the angle at which the planet's axis is tilted in relation to its orbit around the Sun. This tilt is responsible for the changing seasons on Earth and plays a significant role in shaping the planet's climate and weather patterns.

Is planet vinus capitalized?

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Yes, the word "Venus" is capitalized because it is the name of a planet.

How do you win the lotto on mini planet?

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Winning the lottery is a game of chance, and there is no guaranteed strategy to win. In order to increase your chances, you can try buying more tickets or joining a lottery syndicate. However, ultimately, winning the lottery is a matter of luck.

How your planet is part of a larger system?

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Our planet, Earth, is part of a larger system known as the solar system. It revolves around the Sun along with other celestial bodies such as planets, asteroids, and comets. The solar system itself is a part of the Milky Way galaxy, which is just one of billions of galaxies in the universe.

Why do the outer planets move slow?

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The outer planets, such as Jupiter, Saturn, Uranus, and Neptune, move slower in their orbits because they are farther away from the Sun. According to Kepler's laws of planetary motion, the farther a planet is from the Sun, the longer it takes to complete one orbit. Therefore, the slower orbital speed of the outer planets compared to the inner planets, like Earth and Mars, is a consequence of their larger orbital paths.

What type of force is mainly responsible for giving celestial object there round shape and keeping them in the shape?

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The force mainly responsible for giving celestial objects their round shape and keeping them in that shape is gravity. Gravity pulls mass inward toward the center, resulting in a spherical or nearly spherical shape for large celestial bodies such as planets, stars, and moons.

Compare and contrast a star and a planet?

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Stars are massive celestial bodies that emit their own light and heat through nuclear fusion. They primarily consist of hydrogen and helium gases. Planets, on the other hand, are smaller celestial bodies that orbit around stars. They do not emit their own light, but reflect the light of their host star. Planets are composed of various materials such as rock, gas, and ice.

What planet orbits in an oval the most?

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The planet with the most elliptical or oval-shaped orbit is Mercury. Its orbit is highly elongated, with a high eccentricity of 0.21. This means that Mercury's distance from the Sun varies significantly throughout its orbit, causing extreme temperature fluctuations on the planet's surface.

Who killed the planet Pluto?

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No one killed the planet Pluto. Pluto was reclassified as a "dwarf planet" by the International Astronomical Union (IAU) in 2006 due to its smaller size and different characteristics compared to the eight classical planets in our solar system. This decision was based on scientific understanding and classification criteria.

What planet is 20 billion miles away?

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The planet that is approximately 20 billion miles away from Earth would be Neptune.

Why is suns core hotter?

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The corona is hotter than the photosphere because the sun's magnetic field carries energy upward from the surface and into the chromosphere and corona. The opposite effect is observed when the magnetic fields cause sunspots to form resulting in cooler surfaces.

Are aliens black?

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Short Answer - who knows.

Long answer - Actually, if one accepts the notion of extraterrestrial beings coming from distant star systems or galaxies many many light years away, it would be presumed that having the technology to travel through space, they could be any colour - the skin colour native to their own home planet.

The 'Greys' (as per Close Encounters of the Third Kind) are so named for their skin tone and big eyes. The 'Black' or 'Dark' beings are so named for their dwarfish and muscular appearance and 'space-suit' colour.

Some movies even portray the 'Greys' as being 'suited' in a skin-like fabric.

What do astronomers use to determine the chemical composition in star?

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The light that comes from the star. The light is spread out into its spectrum and the pattern of spectral lines allow the composition (and temperature) to be determined. The temp can also be found by looking at the black body curve for the star (also from spectrum), or, by looking at the color of the star (difference in intensity of the light through two different color filters typically B and V. The light that comes from the star. The light is spread out into its spectrum and the pattern of spectral lines allow the composition (and temperature) to be determined. The temp can also be found by looking at the black body curve for the star (also from spectrum), or, by looking at the color of the star (difference in intensity of the light through two different color filters typically B and V.

Is black hole the size of an atom?

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The most relevant quantity is the black hole's mass. Note that the black hole's diameter (the diameter of the event horizon, really) is directly proportional to its mass. The largest galactic black holes known seem to be around 20 billion solar masses. Check the Wikipedia "List of most massive black holes" for more details. Note that the mass of some of these black holes is not very well-known.

What does a circle of stars mean?

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Possibly the European Union logo.

It usually means unity, solidarity and harmony.

What is the definition of BTU?

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One btu will heat a pound of water about one degree Fahrenheit in one hour.

What is a protons relative mass?

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The relative mass of a proton measures around 1.0073, "relative" here being defined with respect to the atomic mass unit (or Dalton), a twelfth the mass of a carbon-12 atom in its ground state. So it's convenient to say a proton or neutron's relative mass is roughly 1 (the neutron being just barely heavier).

The relative mass of a substance is much more convenient to use than the actual mass since it is such a tiny fraction of the everyday units of mass.. the approximate number of protons it would take just to get one gram would be about six hundred thousand billion billion!

What is Christian Huygens nickname?

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Christiaan Huygens, an astronomer, discovered Saturn's largest moon, Titan.

Among his other accomplishments:

* he correctly identified the rings of Saturn * mapped Mars * built the first practical pendulum clocks * formulated the wave theory of light

What instruments are used in the song Supermassive Blackhole by Muse?

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Guitar, bass, drums, and a shaker (... or some similar form of percussion instrument).

The guitar and bass have effects on them.

Application of the law of gravitation to explain the formation of black holes?

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Specifically for a black hole the range of gravitational influence is calculated by the "Shwarzchild Radius" and surprisingly the radius is quite small for even the biggest blackhole, If a blackhole had the mass of the earth, then the Shwarzchild radius would only be a centimeter! Meaning you would have to come with in a centimeter of the blackhole to get sucked in.

How far can you go with a boy if your underage?

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Be careful. If you're already thinking about this, then be careful you don't get yourself and the boy into trouble. If you were to hold hands, or even kiss, that would be plenty far for kids of any age. Don't be in a hurry to lose something that you can never get back. I'm not suggesting that you let him kiss you either, but just be very careful.