Since the moon orbits earth, we see it from different angles. The phases of the moon are our changing views of light on the moon. The phase of the moon begins when it moves between earth and the sun. Remember that the moon does not have its own light,... (read more)

In the universe, the moon is the closet planet to earth. The surface of the moon is made of rock, but scientists are not quite sure about the internal composition of the moon yet. But the structure of the moon is most likely similar to earth. It has layers:... (read more)

If you want to leave feedback on an answer, the following icons located underneath each answer allow you to perform feedback functions. The Icon shown... (read more)

Earth is the third closet planet to the Sun, and takes one year to obit it. Mercury, Venus, Mars and Earth are the only four rocky planets in the solar system. They are also called terrestrial planets. Generally, terrestrial planets have a similar structure,... (read more)

A light year is the distance that light travels in a year. The speed of light in vacum is 299,792,458 meters per second, and there are 31,556,926 seconds in a year. Therefore, a light year = 299,792,458 meters per second * 31,556,926 seconds = 9.4605284... (read more)

Signing up with Qsponge could not be easier - provide the following information: Your real name Valid email address... (read more)

Firstly, you need to find a question that you're interested in. There are three (3) methods of finding a question: 1. You can perform a search using the search box located on the header (read more)

Screening tests during pregnancy normally include urine tests, blood tests and ultrasound scans. The purpose of screening tests are to ascertain the level of... (read more)

Ultrasound scan is a useful diagnostic tool, which can provide pregnant women detailed examination of fetal structures. A special gel will be rubbed onto your abdomen to reduce signal loss, and then a probe/transducer will be placed onto your abdomen,... (read more)

A solar eclipse happens when the moon passes between the sun and the earth. Usually we can observe 2-5 solar eclipses every year. If the moon covers only part of the sun when revolving in its obit around earth, it is a partial solar eclipse. A total... (read more)

The sun is at the center of the solar system, and gives us light and heat. The sun is a huge sphere of hot gas, which burns hydrogen and turns it to helium. When the sun does not have any hydrogen left to burn, it will start burn helium, but this wont... (read more)