Universe — Flashcards
Tamil Nadu Board · Class 9 · Science
29 flashcards for Universe (Tamil Nadu Board Class 9 Science) to test yourself on key terms and facts. Sample: "What is the Big Bang theory? When did it"
Interactive on Super Tutor
Studying Universe? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
Free trial, no card needed.
What is the Big Bang theory? When did it occur?
Answer
The Big Bang theory states that the universe began with a massive explosion approximately 13.7 billion years ago. All matter was concentrated in a single point of extremely hot, dense matter. This exp…
What is the observable universe? What is its size?
Answer
The observable universe is the portion of the entire universe that scientists can see and measure using telescopes and other instruments. It has a radius of approximately 93 billion light-years across…
What is the composition of the universe? What are dark matter and dark energy?
Answer
The universe's composition: Ordinary atoms and luminous matter = 4%, Dark matter = ~27%, Dark energy = ~69%. Dark matter is invisible matter detected through gravitational effects on visible matter. I…
Define a galaxy. How many galaxies exist in the observable universe?
Answer
A galaxy is a massive collection of gas, dust, billions of stars, and their solar systems held together by gravity. Galaxies are the fundamental building blocks of the observable universe. Scientists …
Name the three main types of galaxies and describe their appearances.
Answer
The three main galaxy types are: 1) Spiral galaxies - flat, rotating discs with curved arms extending from a central bulge (example: Milky Way). 2) Elliptical galaxies - oval or elongated shapes, rang…
Describe the Milky Way galaxy. Where is our solar system located within it?
Answer
The Milky Way is a spiral galaxy containing approximately 100 billion stars. Its diameter is about 100,000 light-years. It appears as a milky band of light across the night sky (hence the name). Our s…
How far is Andromeda galaxy from Earth? How long would it take to reach it?
Answer
Andromeda is our nearest galactic neighbor, located approximately 2.5 million light-years from Earth. If we traveled at Earth's current orbital speed around the Sun (30 km/s), it would take approximat…
What are stars made of? How do stars produce energy?
Answer
Stars are composed primarily of hydrogen and helium gases in a superheated state called plasma. Stars produce energy through nuclear fusion - hydrogen atoms fuse together to form helium atoms under ex…
+21 more flashcards
Practise AllFrequently Asked Questions
What are the important topics in Universe for Tamil Nadu Board Class 9 Science?
How many flashcards are available for Universe?
How should I revise Universe for Class 9 exams?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Universe
For serious students
Get the full Universe chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for Tamil Nadu Board Class 9 Science. Free to start, no card needed.