The common distance measures we use depend on what we are measuring. For distances within our solar system, or other solar systems, the common unit is the 'Astronomical Unit' (A.U.)1 A.U. = the average distance between the Earth and the Sun. For most everything else, stars, galaxies etc..., the distance unit is the parsec (pc). This is a convenient unit when measuring distances to stars by triangulation (what astronomers call parallax).1 pc = 3.26 light years = about the distance to the nearest star.1 pc = 60 x 60 x 180/pi A.U. = 206265 A.U. --- by definition. for distances within our galaxy or other galaxies it is kiloparsecs (kpc):1 kpc = 1,000 for distances between galaxies, and cosmology it is Megaparsecs (Mpc).1 Mpc = 1,000,000 pc 3. The exception to these is when one is studying smaller object, such as a star or a planet. Then we might use kilometers. For dust grains, we might use microns (1/1,000,000 of a meter).4. It is also common to compare objects. For example, if one is studying a star one might say "its radius is 5 solar radii", meaning it is 5 times the size of our sun. Similarly with galaxies, is it bigger or smaller than the Milky Way.

Mars is 14901 hours far from the earth. He typical time during Mars's closest approach to the Earth every 1.6 years is about 260 days. Humans can get to mars because the have the tools to get there.

Mars formation

Instead of condensing directly, from dust particles to planet, Mars and the rest of the terrestrial planets probably started out as a collection of small particles. Dust particles clumped together to form larger and larger objects. Dust became sand, pebbles, rocks, asteroids, and eventually planetoids. The formation of Mars happened when these particles all came together.

The energy from all these collisions heated up planet Mars, giving it a molten core and volcanic activity. We can see evidence of the end of the planetary formation period because of the impact craters strewn across the surface of the planet. This period was called the late heavy bombardment period, and all the planets in the Solar System were devastated too.

What is the size of Mars? There are so many ways to measure the size of the Red Planet.

Let's start with diameter. The diameter of Mars is 6,792 km across. Just for comparison, that's only 53% the diameter of Earth. In other words, you could put two planets the size of Mars side by side and they would be a little bigger than Earth.

you can pot mars in the earth one time because mars is kind of the same size of the earth.

what i leared

This huge piece of iron, known as Ahnighito, is actually just one portion of a much larger meteorite that fell to Earth from space. It landed in Greenland thousands of years ago, before any people lived there. The original meteorite, called Cape York, was initially around 200 tons—at least six times the size of Ahnighito—before it broke apart in the atmosphere. Two other fragments of Cape York can also be seen in this hall. At 34 tons, Ahnighito is the largest meteorite on display in any museum.

i learned that the sun was a star.the sun Situated at the center of the solar system.i also learned that The Sun is believed to be more than 4.6 billion years old, and is comprised of mostly hydrogen (74%) and helium (25%). The remaining 1% is made up of small amounts of various heavier elements.
i would like to know can the sun die or not? also i would like to know how big is the sun? and how was it made?how big was the Ahnighito before it broke a port?

MARS

All About Mars

Named after the Roman god of war, the planet Mars is located four planets from the Sun. Commonly referred to as “The Red Planet,” Mars tends to give off a reddish hue when viewed from Earth. This is believed to be caused by an abundance of iron oxide on the planet’s surface. Mars is about half the size of the Earth.

Mars has two moons, Phobos and Deimos, both of which are relatively small in size and not shaped in perfect spheres like the Earth’s moon. Mars can be easily seen from Earth without a telescope at a brightness that is only surpassed by the planet Venus, the Moon and the Sun.

Mars has long been considered the most realistic location for life in our solar system, aside from Earth. Many even believe that intelligent life may have once existed on the planet. Scientific exploration of Mars has not produced any evidence of life on the planet. It is believed that the harsh surface environment and extreme solar radiation that saturates the surface of the planet is not capable of sustaining any kind of life.

Currently, the Mars rovers Spirit and Opportunity are close to entering their third year exploring the surface of the Mars, gathering images and information so that we may continue to increase our knowledge and understanding of the Red Planet, as well as the possibility of past or future life on Mars.