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MIND PLUG FIESTA EXPLORE PHYSICS SOCIETY is presenting online event on zoom Event Timing: March 30th, 2021 Event Type: online Contact us at : 0348-4030912 Email: [email protected]

Explore physics society celebrating resolution day 23 march,

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RESOLUTION DAY | HISTORY FROM BEGINNING| EPS Explore physics society celebrating resolution day 23 march,EXPLORE PHYSICS SOCIETY (Est. 23 feb,2021) Joining EPS is the perfect way to stay connected with ...

How massive can a normal star be? Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun, nearly making it the record holder. This star is the brightest object located just above the gas front in the image below.

Close inspection of images taken with the Hubble Space Telescope, however, have shown that Pismis 24-1 derives its brilliant luminosity not from a single star but from three at least. Component stars would still remain near 100 solar masses, making them among the more massive stars currently on record.

Toward the bottom of the image, stars are still forming in the associated emission nebula NGC 6357. Appearing perhaps like a Gothic cathedral, energetic stars near the center appear to be breaking out and illuminating a spectacular cocoon.

The photo was taken with the sample placed between so-called crossed polarizers. Like a polarized sun glass lens, each polarizer is a sheet of plastic that blocks half of the light that hits it. All light can be broken down into vertical and horizontal polarization, so with a polarizer in the correct orientation, it will block all the vertically polarized light and transmit the other half, which is horizontally polarized. If the horizontally polarized light then strikes a second, vertically oriented polarizer, it will be entirely blocked.

A liquid crystal sample placed between the two crossed polarizers can rotate the polarization of light that penetrates the first polarizer and allow it to slip through the second one. That's what generates the colored portions of the image. In the dark regions, the liquid crystal molecules are aligned with one of the polarizers and can't rotate the light's polarization. So the light is blocked. The sample is illuminated with white light, and the color variations come from the same interference effect you see with any thin film, such as a soap bubble.

The liquid crystal molecules are rod-shaped and like to align with their neighbors. But there can be a slowly varying orientation of the molecules as you move across a sample. As you "orbit" one of the topological defects, the rods' orientation goes through one complete 360-degree rotation.