Tunguska

New research suggests the Tunguska event of 1908 occurred when a giant meteor barely grazed Earth's  atmosphere, creating a massive shock wave.

Tunguska remains the best argument for planetary defense.

Delay

The first private manned space launch was delayed yesterday by weather.

The next attempt will be Saturday.

SpaceX

According to reports, SpaceX is worth $36 billion.

That could increase later today.

Virgin

Virgin Orbit's first test flight of LauncherOne, the air-launched rocket meant to carry satellites into orbit, failed yesterday.

Virgin Galactic, meanwhile, is looking for its first commercial manned flight soon.

Discovery

The Discovery Channel will have extensive coverage of the scheduled first private launch of humans into space Wednesday afternoon.

The launch, whenever it happens, will mark the beginning of a new era of the Space Agr.

Trump

President Trump says he might attend the first SpaceX launch of two astronauts to ISS.

The launch is scheduled for May 27.

Mars

Researchers studying seismic activity on Mars are trying to determine how the planet was formed.

They think the key is the composition of Mars' core.