Earth were twice as big? If Earth's diameter were doubled to about 16,000 miles, the planet's mass would increase eight times, and the force of gravity on the planet would be twice as strong. Life would be: Built and proportioned differently. Also to know is, what if the sun was twice as big?
If the sun's mass AND volume doubled, magically and for no reason, then everything in the solar system would be pulled towards the sun with twice as much force as is applied now. If the Sun had twice the mass, it would be as massive as Sirius, the Dog Star.
Similarly, what would happen to Earth if the Sun doubled in size? But when sun gets doubled in size things will really change drastically as earth orbits in habiatable zone when sun is twice as large than now earth will become hot And out waters of sea evaporate and form a water vapour atmosphere around and also suns gravitational effect also increases on earth and we'll be pulled
Hereof, what would happen if Earth's mass increased?
It would increase the mass of the Earth by about 0.000125%, which would cause a gravity increase of diddly squat (that's a technical term). If an object has more mass, then its pull on earth would be greater than an object with less mass, and therefore should fall to earth faster.
What if the sun is bigger?
The sun's temperature, color and diameter are determined by its mass. Bigger stars are hotter and bluer than the whitish-yellow sun, while smaller stars are cooler and redder. Smaller stars produce more frequent blasts of radiation called flares, which would bombard close-in planets.
Related Question Answers
What happens when the sun gets bigger?
When the sun starts to die, it will get bigger and slightly colder, turning into what astronomers call a “red giant”. It will get so big, that it will eat Mercury, Venus and even Earth. Earth could be in big trouble. Does sunlight add mass to Earth?
Since 1 gram is worth 9 x 10^20 ergs, sunlight equals 4 x 10^12 grams/second or 4.4 million metric tons of equivalent mass per second . During the entire life of the sun4.5 billion years, the earth has gained 2.7 x 10^17 kilograms, which is only 1/21 millionth of its mass. What is the size of Sun and Earth?
It is 864,000 miles (1,392,000 km) in diameter, which makes it 109 times wider than Earth. What would happen if the moon doubled in Mass?
Originally Answered: What would happen if the moon was twice its size? Total Lunar eclipses wouldn't last as long and there would be more partial lunar eclipses. The mass of the Moon would presumably be eight times the current mass. This would greatly increase the tidal range. How would your weight on Earth change if the sun were twice as massive as it is now?
If Earth were its present size but twice as massive, we would weigh less. Because Earth is "falling" around the sun, it will eventually crash into it. What if gravity was doubled?
Doubling gravity would put your body under a great deal of stress and could be fatal if you were exposed to it for a protracted period. Stronger gravity would cause blood to pool in your extremities, making your heart work extra hard to keep the blood pumping around your body. Is the sun getting heavier?
Over the past 4.5 billion years, the Sun has gotten hotter, but also less massive. The solar wind, as we measure it today, is roughly constant over time. There are the occasional flares and mass ejections, but they barely factor into the Sun's overall rate at which it loses mass. Could we live on Super Earth?
According to one hypothesis, super-Earths of about two Earth masses may be conducive to life. The higher surface gravity would lead to a thicker atmosphere, increased surface erosion and hence a flatter topography. Can a human survive 2x gravity?
2x gravity would be bearable, it would not kill you, you'd be able to walk around and do things but Even if the atmosphere had oxygen and was breathable it would be rather dense and this would make breathing difficult. You'd probably hyper-ventilate and pass out from not enough oxygen absorption. Is the Earth getting bigger?
New crust is continually being pushed away from divergent boundaries (where sea-floor spreading occurs), increasing Earth's surface. But the Earth isn't getting any bigger. What if Earth was bigger than the sun?
With the Earth as big as the Sun, you'd pretty much lose the Moon either way. But if a planet has more mass, it will also have a stronger gravitational pull. The reason why our Solar System moves the way it does now is because the Sun's mass is so great, its gravitational pull forces other planets into its orbit. What if Earth had rings?
Just as the moon currently does, the rings would reflect sunlight back to Earth at night and appear to glow in the night sky. The rings would probably reflect so much sunlight that the planet would never fully plunge into darkness, but remain in a gentle twilight even in the depth of night. What would happen if we lost the moon?
A missing Moon could cause a lot of confusion for animals all over the world. Predators rely on both the darkness of night and a small amount of moonlight to effectively hunt. Without any light at night, prey would likely thrive because predators would have a harder time spotting them. What if Earth had two moons?
The Earth would also adjust to its two Moons, giving life a chance to arise. But life on a two-mooned Earth would be different. The combined light from the Moon and Luna would make for much brighter nights, and their different orbital periods will mean the Earth would have fewer fully dark nights. What if gravity was 10x stronger?
If earth's gravity is increased 10 times in an instant, the size of the sphere would contract into a new equilibrium with higher density, which means higher pressure and temperature. The now thinner crust of Earth would be heated up beyond melting point and all life on earth would end. What would happen if the moon was the same size as Earth?
If the Moon were suddenly the same size as Earth then the tides would become huge and swamp vast areas of land. The energy from this would slow the Earths rotation till one side always faced the moon just as one side of the Moon always faces the earth. What if there were two suns?
The two suns would probably appear to orbit each other roughly edge-on as seen from Earth, which would lead to a strange new phenomenon: an eclipse of the sun by another sun! Because of the 10-day orbit, Sun 1 and Sun 2 would pass in front of each other every 5 days. How would gravity forces change if the sun got much bigger?
The pull between Earth and Sun grows weaker, and the planets would drift farther from the Sun, spending much more time at much greater distances from the Sun. So really, any change to the strength of gravity, or any change to the masses of the objects involved, would change the distance between the Earth and the Sun. How does the sun affect weight?
There is very little difference in your weight at noon or midnight due to gravity effects of the sun. That means that at noon, it's pulling you toward it just a little more than the extra upward push you get from the earth. So yes, your weight is a tiny bit less at noon due to the sun's pull. How the sun affects life on Earth?
Nothing is more important to us on Earth than the Sun. Without the Sun's heat and light, the Earth would be a lifeless ball of ice-coated rock. The Sun warms our seas, stirs our atmosphere, generates our weather patterns, and gives energy to the growing green plants that provide the food and oxygen for life on Earth. What would happen to the moon if the Earth's mass decreased?
A less massive moon would also orbit closer to Earth than the real one. This makes it spiral a little farther outward with every orbit around Earth. (Each lunar revolution takes about 29.5 days). If the moon were half its mass, then the ocean tides would have been correspondingly smaller and imparted less energy to it. What would happen if the mass of the sun decreased?
When the mass of the sun decreases, the strength of the gravitational pull decreases. Consequently the planets will break off from their orbits. Once the Earth loses it's heat from the sun all life on earth will perish. If that isn't enough fall through space could land us in a black whole or crash into commet. How would you describe the moon's movement?
The Moon moves around the Earth in an approximately circular orbit, going once around us in approximately 27.3 days, or one sidereal period of revolution. As it does this its position changes, relative to the stars. The apparent motion of the Moon from hour to hour; each hour it moves about one diameter to the East. 
