Planetary Science

Venus is visible most of the time if you know where to look. The only times it cannot be seen are when it's too close to the Sun, which happens for a short period (maybe a month) about every 9 months or so.

White dwarfs are very hot but give off little light, as they are small and dense remnants of low- to medium-mass stars. The high temperature comes from residual heat left over from their evolution, but they do not have enough mass to undergo fusion and generate significant light output.

Neptune is the farthest planet from the sun in our solar system.

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Mercury has a regolith that is largely the product of weathering, with a surface covered in impact craters and space weathering effects due to its lack of a substantial atmosphere to shield it from cosmic rays and solar wind.

Sirius B is a white dwarf. As the name suggests, it will appear white.

The Earth did not explode but it had a fairly heavy collision with a planet called Theia about 4.6 billion years ago.

Jupiter is the fastest rotating planet in our solar system, completing a full rotation on its axis in about 9.9 hours. This rapid rotation causes the planet to have a bulging appearance at its equator and results in strong atmospheric winds.

No matter where earth and Neptune are in their orbits about the sun, Neptune will always be the furthest planet from us. The reason is that the distance between Uranus and Neptune is much greater than the distance between the earth and sun.

The Jovian planets are Jupiter, Saturn, Uranus, and Neptune. These planets are large gas giants primarily composed of hydrogen and helium, and they are located beyond the asteroid belt in our solar system.

In order from the sun:

Mercury

Venus

Earth

Mars

Jupiter

Saturn

Uranus

Neptune

Yes! although there are minor chances of life on Mars but still hope is there. according to scientists and pictures sent back by the Mars Rovers, there are clear signs that once water did did did flow on the surface of red planet. so if there was water,there may well be life still. somewhere deep into the Martian surface, Bacteria might still be active. there are a lot of research going on that and also NASA plans to send first manned mission to the 4th planet as late as 2033.

The gravity of a planet like Mercury is directly proportional to its mass. This means that as the mass of Mercury increases, so does its gravity. Gravity is the force of attraction between two masses, and the larger the mass of an object, the stronger its gravitational pull.

The term "planet" is derived from the Greek word "planetes," which means "wanderer." In ancient times, planets were described as moving stars compared to the fixed stars in the sky. This is why they were called planets.

There is no specific planet known as the queen of planets. In our solar system, Jupiter is often referred to as the "king of planets" due to its large size and gravitational influence. Venus is sometimes associated with being the "queen of planets" due to its brightness and beauty in the night sky.

That is called parallax and it happens when a nearby star appears to move against the background as the Earth moves round the Sun. The baseline is the mean radius of the Earth's orbit (not the diameter) and a star which has a parallax of 1 arc-second would be at a distance of 1 parsec.

In practice the nearest stars have a parallax of about 0.7 seconds so are at a distance of 1.4 parsecs or 4 light-years.

Parallaxes are always small and require sensitive instruments to measure. The lack of parallax was formerly used as a proof that the Earth must be fixed, and it took until 1838 for Bessel to measure the first stellar parallax. After that people began to realise that the stars are much further away than they had thought.

The average distance between the Sun and Earth is about 93 million miles (150 million kilometers).

The are probably many we haven't discovered yet. However currently there are five known dwarf planets.

Not all protostars become true stars. Some protostars may not have enough mass to sustain nuclear fusion in their cores and never become true stars, instead becoming failed stars known as brown dwarfs.

No, the Earth's gravity pulls the moon in towards Earth.

The four furthest planets from the sun are the gas giants; Jupiter, Saturn, Uranus and Neptune (being the furthest planet out). There are some dwarf planets beyond Neptune though, including Makemake, Sedna and Pluto.

Mercury, Venus, Earth, and Mars are terrestrial planets, characterized by their solid, rocky surface. Jupiter, Saturn, Uranus, and Neptune are gaseous planets, composed mostly of gas and lacking a solid surface.