826. The first who attempted to measure stellar distances?
James Gregory
827. The length of an Earth day is determined by the time required for approximately one?
Earth rotation
828. The apparent rising and setting of the Sun, as viewed from Earth, is caused by?
Earth’s rotation
829. The apparent daily path of the Sun changes with the seasons because?
Earth's axis is tilted
830. An inter stellar cloud of dust, hydrogen, helium and other ionized gases are called?
Pulsars
831. First pulsar was discovered by?
Jacelyn Bell
832. The pieces of rocks, which move around the sun are called?
Meteoroids
833. The tilt of the Earth on its axis is a cause of the Earth’s?
changing length of day and night
834. Compared to the distances between the planets of our solar system, the distances between stars are usually?
much greater
835. Why does the moon appear to move across the sky during the night?
Earth rotates on its axis.
836. What time of year is the sun farthest from the earth?
Summer in the Northern Hemisphere.
837. As per Microwave Anisotropy Probe (MAP) what is the exact age of the universe?
13.7 billion year after the theoretical Big Bang
838. Name the British astronomer who, told that the Universe was not limited to the solar system, but is much vaster than that?
Sir William Herschel
839. Stars whose brightness increases to 20 magnitude or more due to explosion in the star is called?
Supernovae
840. What is a star?
A star is a gaseous self-luminous body in space
841. What is a parsec?
The word "parsec" is made up of the parts of the words "parallax" and "second". It means the distance from the Earth to a star whose parallax is one second of arc.
842. What does magnitude mean?
Magnitude is the measure of the brightness of a star or of any luminous body in the heaven
843. When the hydrogen in a star is depleted, its outer regions swell and redden such stars are called?
Red giants
844. The brightest star is?
Taurus
845. What does the colour of the star signify?
846. What are variable stars?
847. Which star is not seen to change its position in the sky?
Pole star
848. What are called as lighthouses in the sky?
Neutron stars
849. What is the colour of the young stars in the sky?
Blue
850. Where is the highest altitude of the star Polaris be observed?