Echoes from Infinity

  SOLAR ECLIPSE AND LUNAR ECLIPSE   SOLAR ECLIPSE  A solar eclipse occurs when the Moon comes between the Earth and the Sun, blocking the sunlight and casting its shadow on the Earth. This phenomenon takes place only during a new moon phase. Depending on the alignment, a solar eclipse may be total, partial, or annular. In a total solar eclipse, the Sun is completely covered by the Moon; in a partial eclipse, only a portion of the Sun is covered; and in an annular eclipse, the Moon covers the central part of the Sun, leaving a bright ring-like appearance. A solar eclipse is visible only from certain regions of the Earth and should not be viewed directly with the naked eye because it can damage the eyes. LUNAR ECLIPSE   A lunar eclipse, on the other hand, occurs when the Earth comes between the Sun and the Moon, causing the Earth’s shadow to fall on the Moon. This event happens only during a full moon phase. Lunar eclipses can be total, partial, or penumbral. In a tota...

PLASMA: The Most Abundant State of Matter in the Universe “We are made of star-stuff.”                           -  Carl Sagan What is Plasma? When we think about matter, we usually remember three states: solid, liquid, and gas. But there is a fourth state — plasma — and it is actually the most abundant form of matter in the universe. Plasma is an ionized gas. This means that when a gas is heated to extremely high temperatures, its atoms lose electrons. As a result, we get a mixture of: Free electrons (negative charge) Positive ions Neutral particles (sometimes) Because of these free charged particles, plasma conducts electricity and responds strongly to electric and magnetic fields. Why is Plasma So Abundant? Nearly 99% of the visible universe is in the plasma state. This is because stars, including our Sun, are made of hot ionized gases. Examples in the universe The Sun and other stars Interstellar medium  Nebu...

Star Birth: The Cosmic Journey from Cloud to Star. 1. Stellar Nurseries: The Cradle of Stars Stars are born inside vast, cold, and dense regions of interstellar space known as molecular clouds. These enormous clouds are mainly composed of molecular hydrogen (H₂), helium, and microscopic dust particles. Their temperatures are extremely low, typically around 10–20 K, allowing gas to remain in molecular form. Within these dark and silent regions, gravity quietly prepares the stage for stellar creation. A beautiful example of such a stellar nursery is the Orion Nebula, where astronomers observe numerous young stars emerging from dense gas. 2. When Gravity Takes Control: The Onset of Collapse Star formation begins when a region within a molecular cloud becomes gravitationally unstable. External triggers such as shock waves from nearby supernova explosions, collisions between clouds, or galactic density waves can disturb the cloud. When gravitational force exceeds the internal gas pressure r...

Tachyons The Particles That Travel Faster Than Light.                                                                               Imagine a particle that can never slow down to the speed of light, but instead always moves faster than light. Sounds like science fiction, right? This is the idea behind tachyons — hypothetical particles that travel faster than light Let us explore what tachyons are, where the idea comes from, and whether they really exist. 1. What is a Tachyon? The word tachyon comes from the Greek word “tachys”, meaning swift. The term was introduced by physicist Gerald Feinberg in 1967. A tachyon is a hypothetical particle that: Always moves faster than light Can never slow down to the speed of light Would have imaginary rest mass (according to equations) They are predicted...