Question

Answer the following questions: -

Q1-Define Astronomy and Celestial objects.
Q2-Analyse the origin of the universe.
Q3-Examine how distance is measured in the universe.
Q4-Identify the galaxy in which Earth is present.
Q5-Define Nebula and Proxima Centauri.
Q6-Analyse the reason why stars appear to twinkle.
Q7-Enlist the main features of stars.
Q8-Do you think sun is a star? Enumerate the main features of the sun.
Q9-Define Solar System
Q10-Analyse the main features of all the planets in tabular form.
Q11-Should Pluto should be considered a draft planet
Q12-Define Satellites.
Q13-Analyse the unique features of Earth in the Solar System.
Q14-Features of the Moon
Q15-Draw a diagram and explain the different phases of the moon .
Q16-Distinguish between an asteroid and comet
Q17-Identify the different constellations

Answer 1

Answer:

• An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe. In astronomy, the terms object and body are often used interchangeably.
• Origins of the universe, explained. ... The best-supported theory of our universe's origin centers on an event known as the big bang. This theory was born of the observation that other galaxies are moving away from our own at great speed in all directions, as if they had all been propelled by an ancient explosive force.
• By observing stars at different times of the year, astronomers use the motion of the earth around the sun to obtain the same parallax effect. ... Turning this discussion around, if we know the luminosity of a distant star, and measure the apparent brightness, then we can infer the distance to the star.
• Earth is in the second largest galaxy of the Local Group - a galaxy called the Milky Way. The Milky Way is a large spiral galaxy. Earth is located in one of the spiral arms of the Milky Way (called the Orion Arm) which lies about two-thirds of the way out from the center of the Galaxy.
• The beautiful Carina Nebula (NGC 3372) is seen at the right of the image glowing in red. It is within this spiral arm of our Milky Way that the bright star cluster NGC 3603 resides. ... The star Alpha Centauri C, Proxima Centauri, is the closest star to the Solar System.
• A star can be defined by five basic characteristics: brightness, color, surface temperature, size and mass.
• Brightness. Two characteristics define brightness: luminosity and magnitude. ...
• Color. A star's color depends on its surface temperature. ...
• Surface Temperature. ..
• Size. ...

Explanation:

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