General Studies Science and Technology Topics

Gagayaan

It is India’s first manned space mission Gaganyaan (crewed orbital spacecraft) which intends to take 3 persons scheduled to be done in 2022. India is collaborating with Russia, France etc in this mission.

Ask Disha

It stands for Digital Interaction to Seek Help Anytime. It is AI (artificial intelligence) powered chat bot of Indian Railways, IRCTC.

Parker Solar Probe mission

NASA solar mission to study the outer corona. Parker Solar Probe will explore Sun’s outer atmosphere and make critical observations about physics of stars. It is designed and built by NASA’s Johns Hopkins University Applied Physics Laboratory. It is named after solar astrophysicist Eugene Parker.

Real 4G vs 4G vs LTE

What is 4G? Difference “real 4G”and “4G”?

The ITU (International telecom unions) had mentioned certain specifications for 4G. The connections that meet these requirements are known as “real 4G”. There are lot of companies which advertise as 4G, which may not meet these requirements but are known as 4G.

Read about the 4G specifications (Click here)

How to find if the connection is “real 4G”or 4G?

Running speed test and comparing with the specifications. It can be noted that the disclaimer of most companies would have fine prints that cover the legal hassles  if some one complaints that he/she isn’t getting “real 4G”.

What is 3.9 G?

The improvements in 3G, which are better but doesn’t meet the 4G requirements, are known as 3.9 G.

What is LTE?

LTE stands for long term evolution. It didn’t meet the original requirements of 4G, but since it was a significant improvement over the 3G, it is regarded as 4G.

Science and Tech - Hydroponics

Hydroponics

The plants depend on soil for nutrients. In hydroponics the plants get the nutrients without being planted in soil. It is a method of growing plants using mineral nutrient solutions without soil. Hydroponics has several branches like aeroponics, aquaponics etc.

Gravitational Waves

What are gravitational waves?

They are ripples that carry energy across the universe (ripples in the curvature of space-time continuum). The existence of the gravitational waves was made by Albert Einstein in his general theory of relativity. Till now there was no direct evidence as these waves are hard to be detected.

source:scienetechdaily.com

 How proved?

By BICEP2 (Background Imaging of Cosmic Extragalactic Polarization) - a telescope at South Pole

Why important?

In proving big bang theory and cosmic inflation.

What is cosmic inflation?

A theory by Alan Ruth that universe expanded very rapidly during its initial formation time.