The sun Definition and 622 Threads

whats up guys. help me out NASA is giving serious consideration to the concept of solar sailing. A solar sailcraft uses a large, low-mass sail and the energy and momentum of sunlight for propulsion. The total power output of the sun is . How large a sail necessary to propel a 10,000-kg...

Currently the Earth has two extreme distances from the sun: Apogee and Perigee (one minimal, one maximal). Shouldn’t there be four extreme distances between the sun and the earth: pair of opposite minimums and pair of opposite maximums? Both the sun and the Earth have mass. So, there must be...

So I was playing around with Celestia and watching last year's transit of Mercury and this year's transit of Venus. They seemed pretty accurate to diagrams I've seen for ingress/egress locations. Then I got an idea. I flew to Mars and went looking for a transit of Earth, and to my surprise I...

sir, I have to questions, 1. is it possible to change the helium of the sun to hydrogen. 2. can laser stop the electromagnetic wave if laser is charged to the electromagnetic wave face to face. soumya

I find it obvious, as did many previous people, that the sun goes aroudn the earth. I of course know htis to be untrue as it has been drummed into me again and again for the past 16 years. Can someone please prove to me (so that i can prove to others as well) that the Earth goes around the...

How can the sun have much mass if it's just a bunch of gasses? And also what keeps the sun in a circlular shape? I've always wondered.

This might seem like a silly question to most of you but I’m going to ask it anyway. Why do all the planets orbit the sun?

Distance to star, much little Considering the effects of the relativity theory in terms of the curvation of space, I am wondering if for the calculation of the distance to the stars using the parallax method (below 100ly), the effect that the sun is creating a deformation in the solar system...

I have a few questions about Mars I hope you can enlighten me about. Firstly,what does the sun look like from Mars,that is the comparative size of the disk with that on Earth? I saw a very poor picture somewhere on the web but couldn't really get a handle on it,perspective/lack of points of...

What if our Sun was a blue giant or was some other color? Would the planet be lit with that color? What would it be like? Our Sun is yellow/orange, but we don't live under that kind of light, our light is more just white, but I don't know why. How would the color of a star be apparent on its...

How many Earth years is Jupiter's orbit around the sun? is it 162 years?

How much mass does the sun add to the Earth each day?

Tides due to the moon vs. the sun? The acceleration of gravity on the Earth due to the sun is 177 greater than gravity on Earth due to the moon. Why are the tides predominantly due to the moon and not the sun, in spite of this number? Nautica

posted by MARCUS. if it was only energy density that would be mysterious enough but have you registered that it is, to a small extent, the pressure inside the core of the sun that makes the sun attractive to the Earth and holds us in orbit...

I have heard that the centre of the Earth is hotter than the sun, and it is the place where hell is. What are your opinions on this?

is the Sun a sphere (like the Earth) or is it more oval-shaped and elliptical? because, since the Earth is (nearly) spherical, the moon has a (nearly) circular motion. BUT, many (if not all) of the planets in the solar system have ELLIPTICAL orbits. This leads me to believe that the Sun...

When you hold a piece of paper up to sunlight it looks white. But when we look at the Sun it looks yellow. Who's first with the answer?

A french poster (ant284) just came to HomeworkHelp with a question about the lifetime of the sun. Some say the sun will go red giant when it has consumed 12 percent of its hydrogen. The sun is now 75 percent hydrogen. We know its mass so we can tell how much hydrogen is supposed to be...

By how much, if at all, is a ray of light bent when it passes by the sun a million miles from center? The bottom line is, do you have an order-of-magnitude feel for the sun's gravity? Can you judge the rough size of the bending angle well enough to spot it in the line-up? In natural units...

i want reply to "Why Do Electrons Move?" (sorry, but the thread is closed..) i think the sun is the white hole. i think all electron comes from the sun. and electron goes into the sub-nucleus. i think sun is not burn out. it will be permanently. from this point of view, i want ask...

At this distance from the sun, how much would a copy weigh? In other words, with what force (in Newtons, or Planck units, or dynes, or tons---your choice) would a copy be attracted if it were at Earth's average distance? How about this? The Earth's speed, in its roughly circular orbit...

I am missing something here. In old Star Trek episodes, Captain Kirk and Captain Picard were often caught in the gravitational pull of a nearby sun and had to really turn on the engines to escape this terrible force. Where on Earth did this concept of the sun’s gravity come from? In case...