To determine the luminosities of the globular clusters, Shapely measured the periods of brightness of the RR Lyrae stars in the clusters. Once he knew the luminosities, he could calculate their distances from Earth. How Many Stars Are in the Milky Way? It's complicated, but you can use Newt...
Also make sure you have access to dark skies. As magnification goes up, apparent brightness of the image goes down. Poor optical design can hack off the sides and you will see this clearly, if you can hold the actual binoculars in front of you. If shopping on the Internet, you'll have...
You can use the changes in the light intensities to calculate the rate of the asteroid's rotation. Comets and Meteors Comet Kohoutek Photo courtesy of NASA A comet or a meteor streaking across the sky is an exciting sight for anyone, and a telescope can make these objects even more ...
Estimating distancesin astronomy is challenging. Think of how hard it is to estimate the distance of someone pointing a flashlight at you on a dark night. Galaxies come in a very wide range of sizes and masses. Measuring a galaxy’s brightness or apparent size isnot a good guideto its dis...
By comparing the intrinsic brightness to the star's apparent brightness, we can get a good measure of the star's distance by applying the 1/r^2 rule. The 1/r^2 rule states that the apparent brightness of a light source is proportional to the square of its distance. For example, if ...
Calculate Resistance from Luminosity: To change the LED brightness is to control the voltage that go through the LED. Connecting a resistor with higher resistance will make the LED dimmer. To get an accurate combination of resistors, you can use aVoltage Divider Calculatorto help. ...
Astronomers use Cepheid stars to measure distance. First, the period of a distant Cepheid is measured. The period is the length of time between brightness peaks. Next, they measure the peak luminosity of the star itself; this gives them the apparent brightness. Then, assuming that all Cepheid...
Intensity is a quantity that is normally used when referring to light or sound. In physics, intensity refers to a fraction with the power output of the source at the numerator and the surface area where the quantity propagates as the denominator. Answer and Explanation: The b...
In order to thrive and grow, your weed needs… Light (brightness has a huge effect on yields) Air (fresh air with a slight breeze is best) Grow Medium (place to grow, soil isn’t your only choice) Temperature (room temperature or a little warmer is perfect during the day, cannot stan...
For example, we can calculate the distance to a star once we know its luminosity, or energy output. (Luminosity is not the same as the star’s apparent brightness, although the two values are “connected.”) For a brief explanation of the luminosity method, click on the link below. ...