Elliptical Orbit

Q.

1. What Is Meant By Perigee And Apogee

Q.

A planet revolves around the sun in an elliptical orbit. If ${\mathrm{V}}_{\mathrm{p}}$ and ${\mathrm{V}}_{\mathrm{a}}$ are the velocities of the planet at the perigee and apogee respectively, then the eccentricity of the elliptical orbit is given by:

Q. The elliptical orbits on which planets move around the sun are structures devised to study motion of planets around the sun.

1. imaginary
2. actual
3. physical

Q. Shape of the orbit traversed by earth around the sun is ____.

1. circular
2. spiral
3. oval
4. conical

Q. Edwin Powell Hubble, an American astronomer, is regarded as the father of ______.

1. Philosophy
2. Astronomy
3. Observational Cosmology
4. Distant stars

Q. Explain how you can locate the Pole Star with the help of Ursa Major. [3 MARKS]

Q. Planets orbit around the sun in elliptical orbits due to gravitational interactions between the planets and the ___.

1. comet
2. moon
3. other planets
4. sun

Q. The irregular shape of the galaxies is due to __.

1. solar explosions
2. celestial bodies
3. rotation of planets
4. gravitational pull

Q. Elliptical galaxies are believed to be formed due to collision of smaller spiral galaxies.

1. True
2. False

Q. Moon move around the earth in the outer space in circular orbits.

1. True
2. False

Q. The path of which of the following celestial objects is mapped using the ecliptic plane?

1. Rigel
2. Sun
3. Betelgueuse
4. Pole star

Q. Who is credited for starting the discussions on the shape of planetary orbits?

1. Claudius Ptolemy
2. Johannes Kepler
3. Edwin Hubble
4. Galileo Galilei