The two galaxies are moving towards each other and will collide after some four billion years.
SpaceX has an installed capacity to build about 400 rocket engines per year, that is, over 100 launches by 2020.
A report by the US intelligence agencies has warned that China and Russia are developing space weapons to be used against satellites in future conflicts.
Researchers have not been able to fully explain the physical processes that produce the colourful aurorae.
The total solar eclipse captured by Nasa's Solar Dynamics Observatory (SDO), kicked off this year's eclipse season.
A new image that will be shot next year from outside the Solar System will remind us how the Earth is nothing more than "a mote of dust suspended in a sunbeam".
Once it lands on the Red Planet, the rock will be used as target practice for a high-precision laser called 'SHERLOC' positioned on the rover's robotic arm on the rover's arm.
A new study, published in the journal Earth and Planetary Science Letters, contradicts the standard model of our planet's evolutionary history.
"There is no compelling reason at all to assume benevolence, for example, that extraterrestrials are wise and kind due to their ancient civilisation's experience".
The ocean, named Kraken Mare, measures 400,000 sq km and is mainly composed of liquid methane at -184 degrees Celsius.
From an outpost on the moon and build flying cars to funding cut for the international space station and earth science missions, the budget covers a lot of things
The moon is believed to have slowly distanced itself from the Earth at a time when the Sun shone around 30 percent less brightly than today.
The ISS could be handed over to the private sector like a piece of real estate.
It will eventually stop tumbling, but that is not likely to happen for millions of years.
The clip is part of the second season of National Geographic's documentary series "Mars" scheduled to air in spring.