Astronomy

Most certainly, yes. There are 23 hours 56 minutes and 4.1 seconds (very nearly) in a SIDEREAL day. The sidereal day is a very important concept, although it is not an easy one to understand initially. The earth rotates exactly 360 degrees, a full rotation, in 23 hours 56 minutes and 4.1 seconds. One day of Universal time (UTC) is exactly 24 hours in length, during which the earth rotates a little more than 360 degrees. It should be obvious that the beginning of the sidereal day will wander around the standard clock-- all the way round, in fact, during the course of a year. For example, there is a day when "sidereal midnight" will coincide with noontime at Greenwich.

The main-sequence lifetime is a phase in a star's life when it fuses hydrogen into helium in its core. This phase typically lasts about 90% of a star's total fusion lifetime. After the main sequence, a star may continue to fuse other elements, depending on its mass, which will determine the total duration of its fusion lifetime.

The upper mass limit for main-sequence stars is around 100 solar masses because the intense radiation and stellar winds in massive stars lead to mass loss through stellar winds and prevent the star from accreting enough material to exceed this limit. Additionally, stars with masses above 100 solar masses would generate such strong radiation pressure that it would overcome the force of gravity, preventing the formation of stable stars with higher masses.

Copernicus.

In the 1500s Polish scientist Copernicus upset the standard belief of his time that the Sun and planets revolve around the Earth. He said the planets went around the Sun.

The earth was known to be round as early as 7th century B.C. The answer to your question is unknown

A spectroscopic binary star is detected by observing periodic shifts in the spectral lines of the star indicating the presence of a companion, while a visual binary star is detected through direct observation of two separate stars orbiting each other. Spectroscopic binaries are often too close together to be resolved visually, making spectroscopy a crucial tool for their detection.

Yes, both Kepler and Newton used mathematics to support the heliocentric view of the universe. Kepler formulated his three laws of planetary motion based on careful observations and mathematical analysis. Newton's law of universal gravitation provided a mathematical explanation for planetary motion around the Sun, further solidifying the heliocentric model.

After defeating Frieza on Planet Namek, Goku used the Namekian Dragon Balls to wish for his friends to be transported to Earth while he stayed behind with King Kai. He was later found by a Ginyu Force spaceship and used it to escape just before Namek's destruction.

The mood of the poem "And many an eye has danced to see the banner in the sky" is celebratory and joyous, as it describes the excitement and beauty of a banner flying high in the sky. The imagery evokes a sense of wonder and admiration for the spectacle.

No, it is not catastrophic when the planets align. Planetary alignments are relatively common and do not have any significant impact on Earth or its inhabitants. They are simply a natural and regular occurrence in our solar system.

Uranus and Neptune are the two jovian planets that do not have a significant internal heat source. They receive most of their heat from the sun and do not generate as much internal heat as Jupiter and Saturn.

When talking about asteroidal impacts, it's worth noting that the diameter of an object is not an indication of potential impact. The density and more important is the velocity at which it impacts the Earth is.

However, an asteroid with a diameter of 70 miles would not destroy the Earth. The Earth has been hit by much larger objects (Theia) and survived - yet only just.

A 70 mile asteroid would make a large impact but it would not destroy the Earth.

A 70 mile asteroid would however, with the right velocity and angle, in all probability, wipe all life off of the Earth and cause years of non regeneration. Simple life would eventually recolonise the planet, but it would take millions of years for complex animals to evolve. So much so, that a devastation on that scale would eliminate mankind from the Universe as we know it.

The asteroid that wiped out the Dinosaurs and ended their reign was a mere 10 miles in diameter and produced 2 million times more energy that our most powerful atomic bomb.

So the 70 mile asteroid would not destroy the Earth but it would certainly destroy everything on it.

Mental brightness is often referred to as mental acuity or cognitive sharpness. This can describe a person's ability to think quickly, clearly, and effectively.

Stellar parallax demonstrates the Earth's motion around the Sun by observing the apparent shift in the position of nearby stars against more distant background stars. This phenomenon confirms the heliocentric model of the solar system and provides direct evidence of the Earth's orbit.

Inertia of direction in astronomy is demonstrated by the tendency of celestial objects to maintain their direction and speed of motion unless acted upon by a significant force. Examples include the consistent orbit of planets around the Sun, the fixed axis of rotation of the Earth, and the straight-line path of comets through space.

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Well, the horizon is just where the sky and earth APPEAR to meet. So it's kinda your decision... :)

The average distance from the Sun to Earth is about 93 million miles (150 million kilometers), and this distance remains relatively constant over time due to Earth's slightly elliptical orbit. So, the distance between the Sun and Earth would be roughly the same in the years 1100 and 2012. Any perceived variations would be due to normal fluctuations in Earth's orbit rather than any significant long-term change.

Saturn is not a bad planet in the moral sense of good and bad, there are good law abiding people and bad criminals. However, Saturn a gas giant is not a livable planet. The gravitational pull is much too strong, Saturn has very cold, very poisonous gas. There is no way a human being could live on Saturn, although, we might be able to live on one of it's moons/satellites.

It depends on what you mean by the word bad. Saturn is a planet and not good or evil. However, no human being could ever live on the planet Saturn, so in that sense of the word; Saturn is a bad, terrible place for humans to try and live.

Very nice one......

1. The astronomers predict the distance between us and star.

2. The astronomers predict the age of star.

3. By noticing the intencity of light they predict the star is going away or coming near.

The Moon averages about 250,000 miles from the Earth. A good bike can average about 10 miles per hour. So, IF there was a road from the Earth to the Moon, and IF you could pedal your bike in a spacesuit (since there's no air), then it would take about 25,000 hours. That's assuming that you didn't stop along the way to eat, drink or sleep.

ASTROLOGY is the study of star signs, and reading peoples future through horescopes through 'reading the stars' and the 'current position of the planets / moons.'

It is the theory that your future / luck / fate can be predicted by studying the position of the planets, etc.

in Hinduism it is known to predict the correct time for a couple's wedding...if their stars don't match or are not in the correct position for their wedding / married life to be thought successful, then they are not married until those stars match in order for their married life to be considered successful.

ASTRONOMY is the study of space, galaxies, stars and the journey to find life in space. it is basically the study of the universe and everything in it.

ASTRONOMY is based on Science-everything is scientific

However, Astrology has no basis, it cannot be proven it can just be believed.

Hope that helps...that's only using my general knowledge.

Spring is a good season for observing distant galaxies because it offers clearer skies with less atmospheric turbulence compared to other seasons. This results in better visibility of faint objects, allowing astronomers to capture more detailed images of distant galaxies. Additionally, spring nights are longer and have darker skies, providing more observing time for studying these celestial objects.

Pluto

Thanks for the answer! Unfortunately I meant to restrict the question to the 5 planets visible with the unaided-eye. Mercury, Venus, Mar, Jupiter & Saturn (excluding Earth). My mistake. Then again, perhaps its the planet furthest from the sun would have the greatest deviance from a perfect circular orbit. In that case, of the classical 5, it might be Saturn.

The umbra is the portion of a shadow from within which none of the light source is visible.

The penumbra is the portion of a shadow from within which part but not all of the light source is visible.

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"Umbra" is the area of total shadow, while "penumbra" is the area of partial shadow.