What determines the color of a star other than temperature?

Omega Centauri
Colorful Stars Galore Inside Globular Star Cluster Omega Centauri. Credit: NASA, ESA, and the Hubble SM4 ERO Team

The stars are one of the wonderful objects in the sky which can be seen with naked eyes. When you look at the sky some stars appears brighter than others which may be either due to closeness of one star as compared to other or due to its bigger size. You also have observed that mostly stars appear white but some stars appear reddish and even bluish. Continue reading “What determines the color of a star other than temperature?”

Potentially Hazardous Asteroid to Fly by Earth Safely on January 26

Near Earth Asteroid Eros
This image, taken by NASA’s Near Earth Asteroid Rendezvous
mission in 2000, shows a close-up view of the asteroid Eros.

Asteroids are one of the most hazardous objects in the solar system. The NASA keeps close eye on potentially hazardous objects and allows us to know about asteroids coming towards Earth. This time, asteroid named as 2004 BL86, will be safely pass Earth on 26 January, 2015. The size of the asteroid is estimated to be around 650 m by studying reflected brightness of the asteroid. The asteroid of this size is categorized as Potentially Hazardous Asteroid. Continue reading “Potentially Hazardous Asteroid to Fly by Earth Safely on January 26”

Two New Planets in our Solar System are predicted by Astronomers

New planets in our solar system
At least two unknown planets could exist in our solar system beyond Pluto. Credit: NASA/JPL-Caltech.

The New Planets in our solar system are the objects which attract people more than anything in the universe. The science community is always excited to know about new planet beyond Pluto. Two research papers published this week show the evidences of two new planets beyond the orbit of Pluto. These planets are expected to be much heavier than the Earth and orbiting the sun from such a large distance that their observation with Continue reading “Two New Planets in our Solar System are predicted by Astronomers”

Eta Carinae Nebula and star system explained by impressive 3D model of NASA

Eta Carinae Nebula
Eta Carinae’s great eruption in the 1840s created the billowing Homunculus Nebula.
Image Credit: NASA, ESA, and the Hubble SM4 ERO Team

Eta Carinae is one the most massive and luminous star system in the vicinity of 10000 light years around the solar system. The Eta Carinae star is known for its violet behaviours in the past. In the mid 19th century, it had become so violet and bright that it had become the second brightest star in the sky. During that time it ejected huge amount of mass that can be used to create 10 new Suns. The reason of that tremendous outburst is still not clear. The nebula created Continue reading “Eta Carinae Nebula and star system explained by impressive 3D model of NASA”

Comet Lovejoy: First Naked Eye Comet of the Year 2015

Comet Lovejoy
Comet Lovejoy is the first naked eye comet
of the year 2015. Image credit: NASA/MSFC/MEO/Aaron Kingery

Comets are one of the most fascinating objects in the universe. The view of the bright comet with long tail is one of the rare events which do not happen frequently. It is very rare when you get the chance of watching the comet with naked eye. This New Year has given us a gift in the form of comet which can be seen with naked eye in the first few weeks of January. This comet is known as Comet Lovejoy or more formally C/2014 Q2. This is one of the Continue reading “Comet Lovejoy: First Naked Eye Comet of the Year 2015”

What are Comets?

Comet Neat
Icy Comet Neat. Credit: National Science Foundation

Comets are the most wonderful and dreadful members of the solar system. In the ancient times Comets were considered as warning of God and cause of death of monarch, disasters, plague and famine etc. Comet frightened the people for many centuries but actually Comets are very harmless and powerless. Continue reading “What are Comets?”

What is Supernova Explosion?

Supernova Explosion
Gamma rays released in the Supernova Explosion are harmful for life. (Credit: NASA)

Supernova explosion is one of the violent explosions of the universe which outshines the entire galaxy. The supernova explosion releases tremendous amount of energy and light into the interstellar medium. The brightness of supernova is so large that it can be seen from the billions of light years away. The brightness of supernova is sometimes even larger than the brightness of galaxy in which it occurred. The supernova also releases radiations like gamma rays which can be  Continue reading “What is Supernova Explosion?”

Pulsar a Neutron star with incredibly high magnetic field

Neutron star
Pulsars are Neutron stars with extremely
high magnetic field. (Credit:Dana Berry/NASA)

Pulsars are one of the mysterious objects of the universe. Pulsars are known for their extremely high magnetic fields and regularly pulsating radio signals which appear as artificial signals. What is pulsar? Pulsars are special type of Neutron stars which spins few times in a second and have incredibly high magnetic field. Before we talk about Pulsars lets first discuss about Neutron star after all pulsar is nothing but a neutron star. Continue reading “Pulsar a Neutron star with incredibly high magnetic field”

Stellar Evolution: life of star

life of star
The energy is liberated due to nuclear reaction
happening in the core of star. ( credit: NASA)

Stars are one of the interesting objects of the sky. Stars are big balls of gas in which nuclear reactions are going on producing tremendous amount of energy and light. The life of all the stars starts in the same way from the nebula but death of stars occurs in different ways, some undergo peaceful death while others undergo violent explosions. The stars are the source of different type of chemical elements from which we, objects observed on the Earth and planets are formed. Thus the stellar evolution which involves stages of life of star is an important process. Continue reading “Stellar Evolution: life of star”

The speed of rotation of Earth is decreasing due to revolution of Moon

Rotation of Earth and revolution of moon
The speed of rotation of Earth is decreasing due to revolution
of moon around the Earth. (Credit: NASA)

The days are getting longer due to motion of moon around the Earth. Although this is happening at extremely slow rate but the day length is getting longer. The day length has increased by 1.7 milliseconds during the last 100 years. This seems unusual because we have never felt the elongation of day length. The day length is increasing because of the decrease in speed of rotation of Earth. The revolution of moon around the Earth is applying a pull which is trying to slow down the rotation of Earth. Let’s understand it in detail. Continue reading “The speed of rotation of Earth is decreasing due to revolution of Moon”