A black hole is a region in space with such strong gravity that nothing, not even light, can escape. It forms when a massive star collapses under its own gravity after exhausting its nuclear fuel.
Category: Class 6 Science
NCERT Solutions and Important Questions for class 6 Science for CBSE exams 2020-2021.
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Venus is called Earth’s twin due to its similar size, mass, and composition. However, its thick atmosphere creates extreme greenhouse conditions, making its surface temperature much higher than Earth’s.
The Moon’s surface features include craters, maria (dark plains), highlands, and rays. Craters are impact sites, maria are flat volcanic plains, highlands are mountainous regions, and rays are bright streaks from impacts.
Earth’s atmosphere protects life by blocking harmful solar radiation, regulating temperature, and containing oxygen for respiration. It also acts as a shield against meteoroids and space debris, preventing them from reaching the surface.
Mars is significant in space exploration due to its potential for past or present life, its similarities to Earth, and its potential for future human colonization. It is a prime target for exploration missions.