Introduction NASA launched Voyager 2 on August 20, 1977, as a space probe with the mission of studying the outer planets and exploring interstellar space beyond the Sun's heliosphere. Voyager 2 is the twin of Voyager 1, which had been launched only a few days prior. Voyager 2 has successfully...
The moon, Venus, Mars, and some of the brightest stars in the sky will be in a rare alignment this week, creating a celestial gathering that will be visible to skywatchers around the world. The moon will be in its waxing crescent phase, and it will appear to be just...
Redshift and blueshift are two phenomena that describe how the frequency of light changes when an object is moving relative to an observer. When an object is moving away from an observer, the light from the object is redshifted, which means that the wavelength of the light increases and the...
