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Planetary Science

Planetary Science is the study of Planets and the Solar System, a combination of Astronomy and Earth Sciences. Find questions about the different planets and more.

25,144 Questions

What planets are like your planet?

My planet is unique, but if I had to compare, it is most similar to Earth in terms of its features such as atmosphere, landforms, and presence of water. However, it also has distinct characteristics that set it apart from other planets in our solar system.

Do falling stars fall in the daytime?

Yes, falling stars (meteors) can still be visible during the daytime. However, they are harder to see because of the brightness of the sun and the scattering of light in the atmosphere. It is much more common to observe meteors at night when the sky is darker.

How many planets rotate clockwisegive the names?

Within the nine old planets, 3 of them have retrograde rotation: rotate clockwise (westward). They are Venus, Uranus and Pluto.

Mercury, Earth, Mars, Jupiter, Saturn and Neptune have direct rotation: rotate anti-clockwise (eastward).

All the nine planets revolve around the sun eastward or anti clockwise.

Can the planets get melted by the sun?

~kpayne12~

No, the sun will not "Blow Up" the solar system.

The life of a star the size of the sun (Sol) is about 10 billion years. During this time period the star uses a nuclear fusion of hydrogen. This means that the sun fuses hydrogen atoms together to make helium atoms. The energy this process creates counteracts the force of gravity crushing in on the core of the star.

Eventually the star's hydrogen supply runs out. Left with only helium, the star begins to be crushed under gravity. The star then tries to make a desperate gamble for life. Under the extreme force exerted by gravity, the core is actually superheated. In this extreme heat the helium atoms accelerate to high speeds and eventually reignite the nuclear fusion process. The star then swells. It expands and then eventually consumes the solar system. The star then exerts this off in waves. The star then is reduced to the size of earth, this is called a white dwarf (some call it a retired star).

This white dwarf has the energy of a red giant condensed into the size of Earth. This white dwarf then continues through the galaxy.

The white dwarf will eventually find a companion. A companion is a second star in a star system (a binary system). The white dwarf then feeds off its larger companion for energy. In theory every star will have will have an average of at least one companion in its life time.

The white dwarf eventually becomes overloaded with energy from its companion and then bursts in what is called a Type A Supernova.

~kpayne12~

Which is farther away from the earth the sun or north star?

the north star. it takes 8 minutes for light to get from the sun to the earth. it takes half a billion years for light to get to us from the north star...i think. but i know that the sun is definetly closer.

How many planets do not have moons that orbit around them?

Of the eight planets in the Solar System, the only two that have no moons are Mercury and Venus. Earth has one moon, Mars two, and the gas giants Jupiter Saturn Uranus and Neptune have dozens between them - no one really knowing just how many there are as new ones are being discovered each year. The first member of the minor planets beyond Neptune - Pluto - is now not designated as a major planet. It has at least three moons. There are many more minor planets beyond Pluto that have moons - and again these are being discovered yearly.

How long does it take for a droplet of rain to reach the Earth?

It depends on the size of the raindrop and the height at which it forms. The larger the raindrop, the faster it will fall. The rain falling to earth begins in clouds as fine droplets, which begin falling very slowly and then collect to form larger drops that fall faster. During the fall, the drops will break up and reform, so the falling speed can vary from 5-20 miles per hour. Rain could take anything from a few minutes to 20+ minutes depending on drop size, height and wind.

Do pluto and charan the moon circle around each other?

Yes, sort of. They basically orbit their common center of mass. The same applies to Earth and Moon; Sun and Jupiter; etc.; two such objects generally have the tendency to orbit their center of mass.

What plannets and other revole around the sun?

the main planets in order of closeness to the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Pluto is now known as a dwarf planet as it is too small to class as a planet.

How many planets does Beta Lyrae have?

Beta Lyrae is a binary star system, consisting of two stars orbiting each other. There is currently no evidence to suggest the presence of planets in this system.

What living things live in planet earth?

Here on earth we have many ecosystems, the animal kingdom being a massive one. While the animals here on earth may not seem to have much affect on making the world go round, if you will, it ultimately does.

To put in perspective, begin to think about the food chain and how if one animal didn't eat it would die, and then another animal would live in that mess. Therefore the animals help keep the earth clean.

Many animals can be domesticated for human services, that be for milking for milk, house pets for enjoyment and a companion or whether that be the animals sheared for their fur to make the clothes some of us wear.

The wild animals eat the natural growing vegetation, and if they didn't we would have overgrowth.

Hope this helps!

Which planets do you think would have great extremes of temperature on the different sides?

Mercury and Venus would likely have the most extreme temperature differences between their day and night sides due to their lack of atmosphere and proximity to the Sun. Additionally, tidally-locked exoplanets, where one side always faces their star, could also experience vast temperature variations depending on their distance from the star.

What is the temperature of an expanding star?

The temperature of an expanding star can vary depending on its size and stage of evolution. Generally, as a star expands, its surface temperature decreases due to the increased surface area over which the energy is distributed. However, the core temperature of the star can increase as it undergoes fusion reactions.

Would the atmospheres on the 4 largest planets support earth type life forms?

No, the atmospheres of the four largest planets in our solar system (Jupiter, Saturn, Uranus, and Neptune) are primarily composed of hydrogen, helium, and other gases unsuitable for Earth-type life forms. The extreme temperatures, pressures, and lack of solid surfaces on these gas giants make them inhospitable for life as we know it.

What are two similarities about the inner and outer planets?

Both inner and outer planets orbit around the sun and have roughly spherical shapes. Additionally, they are part of the same solar system and are composed of similar elements, such as rock and metal for inner planets, and gas and ice for outer planets.

Where is the earth 3 moons?

The Earth only has one natural moon, called the Moon. Earth does not have three moons.

What would happen to the magnitude of the gravitational force between the sun and Earth if Earth was placed in Pluto's orbit?

The magnitude of the gravitational force between the sun and Earth would decrease if Earth was placed in Pluto's orbit. This is because the force of gravity between two objects is inversely proportional to the square of the distance between them, so as Earth moved farther away from the sun (as in Pluto's orbit), the gravitational force would weaken.

What is the Yukatan peninsula mostly made of?

The Yucatan Peninsula is mostly made of limestone bedrock, which is porous and can dissolve easily in water. This geology has led to the formation of underground rivers, sinkholes (cenotes), and a unique landscape in the region.

Why must the inner planets travel faster than the outer planets?

They are closer to the star they circulate around or the other planets and so their centre of gravity is closer, therefore the force is stronger and thus causing their rotation to increase in speed.

What caused dust and condensing material to accrete into planetesimals?

Gravity probably had some effect, but "van der Waals" forces are thought to

have been the main cause, in the early stages.

These are electrical forces between atoms, molecules, etc.

How does the main-sequence lifetime of a star compare to its entire fusion lifetime?

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.

Why is there an upper mass limit for main-sequence stars of about 100 solar masses?

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.

What has more gravity moon or mars?

Mars has 38% approximative gravity to that of Earth, meaning Earth has almost three times as much. While the moon has 16.7% that of the Earth. Meaning Mars has a stronger gravitational pull then that of the moon.