Astronomy

A star was born from gravitational collapse of gas cloud and interstellar dust. On its birth process, a protostar heated by collision of gas molecules on clouds interior. The process continues until it reached the point where hydrogen on its core fused into helium. Four hydrogen nuclei, each with the mass of one proton, are […]

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When we talk about distance, we must use certain unit of measurement. We usually use units of miles or kilometers for depicting distance between two places on Earth. But how about on outer space?
If we describe average distance between Earth and Sun, we got the number of 149.598.000 kilometers. And then, we use this […]

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A patch of Martian soil analyzed by NASA’s rover Spirit is so rich in silica that it may provide some of the strongest evidence yet that ancient Mars was much wetter than it is now. The processes that could have produced such a concentrated deposit of silica require the presence of water.
The alpha particle X-ray […]

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How old our universe is? So far, astronomers had applied several methods to determine the age of the universe. One method is by estimating age of element on our Milky Way galaxy based on radioactive decay of element that its half-period is already known, and then, assumed that the elements created (on a giant star […]

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One Sidereal Day is 23 hours, 56 minutes and 4 seconds long and is defined by how long it takes the earth to spin once around on its axis relative to an inertial reference system. The solar day of 24 hours measures the time between the moment of sunrise and the same moment the next […]

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To support living organism on its surface, a planet have to fulfill some conditions. One important part is the planet’s host star. As astronomers believed, most suitable kind of stars for habitable planet is G-class yellow star, which our Sun is one of it. G-class star are well known to its rareness. Only 10% of […]

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Some of you probably have heard about discovery of extrasolar planet Gliese 587 C. If you don’t familiar with this term, extrasolar planets (exoplanets) refers to planet that orbiting any distant star, beyond our Sun.
So far, astronomers have found more than 200 exoplanets in our galaxy, and this number is still grown. What makes discovery […]

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What is astronomy mean? Term “astronomy” originate from ancient Greek word “astro” (star) and “nemein” (naming), thus, astronomy literally means “naming the stars”. But by definition, Astronomy is a branch of natural science that focused on studying all bodies and scattered matter in the universe, including its origin, evolution, composition, distance, and motion.
Astronomy is […]

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